The World Health Organization says reducing salt or sodium use can reduce your risk of heart disease, kidney failure or stroke. But researchers say the risk would be reduced even more if the amount of dietary potassium was increased at the same time.
The World Health Organization says high blood pressure affects one billion people worldwide. It leads to many deaths or permanent disabilities. High blood pressure, also known as hypertension, is called the silent killer because there are few apparent signs. Many studies have shown that reducing salt or sodium in the diet can lower the risk of stroke and other health problems.
Graham MacGregor is with the Barts and London School of Medicine and Dentistry. He and other researchers have examined earlier studies and organized their own.
“When you’re on the high salt intake you always have some extra salt in you and a slightly greater volume of blood. And that’s what puts up the blood pressure. I mean, if you wanted, an analogous thing would be really a central heating system. If you put more water into a closed system, the pressure will go up.”
He says the body does need salt, about less than half a gram each day. However, people in developing countries are eating about eight to 10 grams a day. Professor MacGregor says lowering salt can do a lot to reduce hypertension, but increasing potassium in the diet also helps. People in industrial nations eat about three grams of potassium a day through diet. Professor MacGregor says experts believe eating about four grams a day is the best choice.
Health officials have expressed concern about developing countries with growing economies. Those nations are increasingly turning to a western diet with its salty, sugary and fatty foods. Officials are predicting a sharp rise in heart disease and related problems.
Which of following has nothing to do with having extra salt in you？
| A．heart disease | B．kidneyfailure | C．stroke | D．toothache |
The writer uses “a central heating system”to_________.
| A．give examples | B．introduce a new thing |
| C．compare the two things | D．contrast the two things |
According to the passage，which of the following statements is true？
| A．The body needs salt, about three grams each day. |
| B．Eating about four grams potassium a day is the best choice. |
| C．Lowering potassium can do a lot to reduce hypertension. |
| D．Reducing sodium in the diet canhigherthe risk of stroke. |
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Teamwork is just as important in science as it is on the playing field or in the gym. Scientific investigations (调查) are almost always carried out by teams of people working together. Ideas are shared, experiences are designed, data are analyzed, and results are evaluated and shared with other investigators. Group work is necessary, and is usually more productive than working alone.
Several times throughout the year you may be asked to work with one or more of your classmates. Whatever teh task your group is assigned, a few rules need to be followed to ensure a productive and successful experience.
What comes first is to keep an open mind, becasue everyone’s ideas deserve consideration and each group member can make his or her own contribution. Secondly, it makes a job easier to divide the group task among all group members. Choose a role on the team that is best suited to your particular strengths. Thirdly, always work together, take turns, and encourage each other by listening, clarifying, and trusting one another. Mutual support and trust often make a great difference.
Activities like investigations are most effective when done by small groups. Here are some more suggestions for effective team performance during these activities: Make sure each group member understands and agrees to the task given to him or her, and everyone knows exactly when, why and what to do; take turns doing various tasks during similar and repeated activities; be aware of where other group members are and what they are doing so as to ensure safety; be responsible for your own learning, though it is by no means unwise to compare your observations with those of other group members.
When there is research to be done, divide the topic into several areas, and this can explore the issue in a very detailed way. You are encouraged to keep records of the sources used each person, which helps you trace back to the origin of the problems that may happen unexpectedly. A format for exchanging information (e.g. photocopies of notes, oral discussion, etc.) is also important, for a well-chosen method not only strengthens what you present but also makes yourself easily understood. When the time comes to make a decision and take a position on an issue, allow for the contributions of each member of the group. Most important of all, it is always wise to make decisions by compromise and agreement.
After you’ve completed a task with your team, make an evaluation of the team’s effectiveness — the strengths and weaknesses, opportunities and challenges.
| Title |
Working Together |
| Theme |
Effective performance needs highly cooperated (71) ________ |
| General rules |
l Keep an open mind to everyone’s (72) ________. l Divide the group task among group members. l (73) ________ and trust each other. |
| (74) ________ |
l Understand and agree to the (75) ________ task of one’s own. l Take turns doing various tasks. l Show concern for others to ensure safety. l Take (76) _________ for one’s own learning. l Compare your own observations with those of others. |
| Explore an issue |
l Break the (77) ________ into several areas. l Keep records of the sources just in (78) ________. l (79) ________ your information with others via proper format. l Make all decisions by compromise and agreement. |
| (80) ________ effectiveness |
l Analyze the strengths and weaknesses. l Find out the opportunities and challenges. |
| Gallery Policies for Visitors to National Gallery of Art, Washington |
|
| Visitors must present all carried items for inspection upon entry. After inspection, all bags, backpacks, umbrellas, parcels, and other things as determined by security officers must left at the checkrooms, free of charge, close to each entrance. All oversized bags, backpacks and luggage must be left at the checkrooms near the 4th Street entrance of either the East or West Building. These items will have to be x-rayed before being accepted items of value, such as laptop computers, cameras, and fur coats, may not be left in the checkrooms but may be carried into the galleries. We regret that we do not have enough space for visitor items larger than 17×26 inches into the Gallery or its checkrooms. Additional security procedures and checks may be taken according to the decision of the Gallery. |
For the safety of the artworks and other visitors, nothing may be carried on a visitor’s back. Soft front baby carriers are allowed, but children may not be carried on shoulders or in a child carrier worn on the back. Pushchairs are available free of charge near each checkroom. Smoking is prohibited. Food and drink are not permitted outside the food service areas. Unopened bottled water may be carried only in a visitor’s bag. Cell phones may not be used in the galleries. Animals, other than service animals, are not permitted in the Gallery. Skateboarding is prohibited. Picture-taking (including video for personal use is permitted except in special exhibitions and where specifically prohibited. Tripods (三角架) are not allowed. Please do not touch the works of art. |
When people come to visit the Gallery, they should ____________.
| A．leave all their carried items at the checkrooms |
| B．have all their carried items x-rayed at the entrance |
| C．take all their carried items with them without inspection |
| D．have all their carried items inspected at the entrance |
What does the Gallery feel sorry for?
| A．Visitors have to keep their valuable items in the checkrooms. |
| B．The size of visitor items allowed into the Gallery is limited. |
| C．It cannot keep oversized visitor items due to limited space. |
| D．Visitor items over 17×26 inches must go through additional checks. |
Parents with small children visiting the Gallery _____________.
| A．can carry their children in soft front child carriers |
| B．can carry their children on their shoulders |
| C．can carry their children in child carriers worn on the back |
| D．ought to pay if they want to use pushchairs for their children |
Visiting photographers should make sure that __________.
| A．pictures and videos are allowed for personal use anywhere in the Gallery |
| B．pictures and videos can be taken in some places for personal use |
| C．picture-taking and videoing are totally forbidden in the Gallery |
| D．tripods are allowed except in some special exhibitions |
We experience different forms of the Sun’s energy every day. We can see its light and feel its warmth. The Sun is the major source of evaporation (蒸发) of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food. These green plants then provide food for all organisms (生物) on the Earth.
Much of the energy that comes from the Sun never reaches the Earth’s surface. It is either reflected or absorbed by the gases in the upper atmosphere. Of the energy that reaches the lower atmosphere, 30% is reflected by clouds or the Earth’s surface. The remaining 70% warms the surface of the planet, causes water to evaporate, and provides energy for the water cycle and weather. Only a tiny part, approximately 0.023%, is actually used by green plants to produce food.
Many gases found in the atmosphere actually reflect heat energy escaping from the Earth’s surface back to the Earth. These gases act like the glass of a greenhouse in that they allow energy from the Sun to enter but prevent energy from leaving. They are therefore called greenhouse gases.
When sunlight strikes an object, some of the energy is absorbed and some is reflected. The amount reflected depends on the surface. For example, you’ve probably noticed how bright snow is when sunlight falls on it. Snow reflects most of the energy from the Sun, so it contributes to the low temperatures of winter. Dark-coloured surfaces, such as dark soil or forest, absorb more energy and help warm the surrounding air.
59. According to the passage, the root cause for weather changes on the Earth is ______.
A. the atmosphere surrounding the Earth
B. water from oceans and lakes
C. energy from the Sun
D. greenhouse gases in the sky
60. Only a small part of the Sun’s energy reaches the Earth’s surface because most of it _______________.
A. absorbed by the clouds in the lower atmosphere
B. reflected by the gases in the upper atmosphere
C. lost in the upper and lower atmosphere
D. used to evaporate water from the oceans and lakes
61. We learn from the passage that _______________.
A. all living things on the Earth depend on the Sun for their food
B. a forest looks dark in winter because it absorbs solar energy
C. only 0.023% of the energy from the Sun is made use of on the Earth
D. greenhouse gases allow heat energy to escape from the Earth’s surface
What time is it? Most people are pretty accurate in their answer. And if you don’t know for sure, it’s a very likely that you can find out. There may be a watch on your wrist, there may be a clock on the wall, desk, or computer screen; or maybe you’re riding in a car that has a clock in the dashboard (仪表板).
Even if you don’t have a timepiece of some sort nearby, your body keeps its own beat. Humans have an internal clock that regulates (调节) the beating of our heart, the pace of our breathing, the discharge (排出) of chemicals within our bloodstream, and many other bodily functions.
Time is something from which we can’t escape. Even if we ignore it, it’s still going by, ticking away, second by second, minute by minute, hour by hour. So the main issue in using your time well is, “Who’s in charge?” We can allow time to slip by and let it be our enemy. Or we can take control of it and make it our ally.
By taking control of how you spend your time, you’ll increase your chances of becoming a more successful student. Perhaps more importantly, the better you are at managing the time you devote to your studies, the more time you’ll have to spend on your outside interests.
The aim of time management is not to schedule every moment so we become slaves of a timetable that governs every waking moment of the day. Instead, the aim is to make informed choices as to how we use our time. Rather than letting the day go by, largely without our awareness, what we are going to discuss next can make us better able to control time for our own purposes.The underlined word “ally” in Para. 3 more likely means somebody or something that is _________.
| A．your slave and serves you |
| B．your supporter and helps you |
| C．under your control and obeys you |
| D．under your influence and follows you |
The author intends to tell us that time _____________.
| A．could be regulated by a timepiece such as a clock or a watch |
| B．could be managed by the internal clock of human bodies |
| C．should be well managed for our own interest |
| D．should be saved for outside interests |
In the next part, the author would most probably discuss with you ________.
| A．how to keep up with the times | B．how to make up for lost time |
| C．how to have a good time | D．how to make good use of time |
Melissa Poe was 9 years old when she began a campaign for a cleaner environment by writing a letter to the then President Bush. Through her on efforts, her letter was reproduced on over 250 donated billboards (广告牌)across the country.
The response to her request for help was so huge that Poe established Kids For A Cleaner Environment (Kids F.A.C.E.) in 1989. There are now 300,000 members of Kids F.A.C.E. worldwide and it is the world’s largest youth environmental organization.
Poe has also asked the National Park Service to carry out a “Children’s Forest” project in every national park. In 1992, she was invited one of only six children in the world to speak at the Earth Summit in Brazil as part of the Voices of the future Program. In 1993, she was given a Caring Award for her efforts by the Caring Institute.
Since the organization started, Kids F.A.C.E. members have distributed and planted over 1 million trees! Ongoing tree-planting projects include Kids’ Yards — the creation of backyard wildlife habitats (栖息地) and now Kids F.A.C.E. is involved in the exciting Odyssey, which is a great way to start helping.
“We try to tell kids that it’s not OK to be lazy,” she explains, “You need to start being a response, environmentally friendly person now, right now, before you become a resource-sucking adult.”
72. Kids F.A.C.E. is __________.
A. a program to help students with writing
B. a project of litter recycling
C. a campaign launched by President Bush
D. a club of environmental protection
73. What can we learn about Poe?
A. She was awarded a prize in Brazil.
B. She donated billboards across the country.
C. She got positive responses for her efforts.
D. She joined the National Park Service.
74. Kid’s Yards is ____________.
A. established in national park
B. started to protect wildlife
C. a wildlife-raising project
D. an environment park for kids
75. Which of the following can be inferred from the text?
A. Adults are resources –sucking people.
B. Poe sought help from a youth organization
C. Kids F.A.C.E. members are from the U.S.
D. Kids are urged to save natural resources.
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