When you look up into the sky at night, have you ever felt that your eyes are playing tricks on (捉弄) you? It seems that the stars are moving all the time.
Actually, there is nothing wrong with your eyes. This twinkling effect is called scintillation (交光). Scintillation happens because of air movements in the earth’s atmosphere (大气). Light is “bent (弯曲的)” when it travels through different parts of the earth’s atmosphere. As the air in the earth’s atmosphere is moving all the time, the light from the stars looks as if it is moving too.
The same thing also happens to things on the ground. On a very hot and shiny day, if you look at the road, the image in the distance is not clear and things move slightly. You can also see the same effect if you drop a rock into water. The rock appears a little unclear under the moving water.
This twinkling effect causes a lot of problems for astronomers (天文学家) since they cannot observe the stars clearly. A telescope (望远镜) was sent into space so that the air movements in the atmosphere could be avoided (避免). It took a long time to build the space telescope but finally in 1990, a huge space telescope called the Hubble Space Telescope was successfully sent into space. Since then, astronomers have many important observations that have helped people understand space better.
根据短文内容，选择最佳选项。 What happens to the light from the stars we see when the air in the earth’s atmosphere is moving?
| A．It looks even brighter. |
| B．It looks as if it is bent. |
| C．It looks as if it is moving. |
| D．It looks like drops of rain. |
Scintillation also happens on according to the passage.
| A．rainy days | B．shiny days |
| C．cloudy days | D．windy days |
What can you see when you drop a rock into the water?
| A．The rock gets broken. |
| B．The rock becomes unclear. |
| C．The water becomes much polluted. |
| D．The water does not move anymore. |
The underlined word “observe” means “ ”.
| A．watch | B．listen | C．draw | D．explain |
Why is scintillation a problem for astronomers?
| A．The stars never stay still. |
| B．It makes the stars too dark to see. |
| C．It makes astronomers feel too hot to work. |
| D．Astronomers cannot observe the stars clearly. |
Mario Green and Mary Brown from Riverside High School give up several hours each week to help others.Mario热爱动物并且想成为一名兽医。 He volunteers at an animal hospital every Saturday morning.Mario believes it can help him to get his future dream job. “It’s hard work,” he says, “but I want to learn more about how to care for animals. I get such a strong feeling of satisfaction when I see the animals get better and the look of joy on their owners’ faces.”
Mary 是一个读书爱好者.。She could read by herself at the age of four. Last year, she decided to try out for a volunteer after--school reading program.She still works there once a week to help kids learn to read. “The kids are sitting in the library, but you can see in their eyes that they’re going on a different journey with each new book. Volunteering here is a dream come true for me. I can do what I love to do and help others at the same time._________________________
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Bikes are popular in the Dutch. In fact, nearly half of all travel in the Dutch is by bike. Now, one Dutch bike designer (设计师), Thomas, has taken the country’s interest in bikes by making a school bus bike.
The big bike has eight sets of pedals (踏板) for kids, a driver seat for an adult, and three other seats, comfortably letting little kids for their trip to and from school. The bike even has a motor, which can help with high hills or at times when few kids on it.
So far, Thomas tells Fast Company, he’s sold 25 school-bikes, at a price of $ 25,000 each—less than it would cost to buy a traditional school bus with the same number of seats. Along with the traditional color, the bikes are colored yellow so that they can be seen easily.
Thomas says he’s sold school bus bikes to neighboring countries such as Belgium. England and Germany, but so far, the school bus bike hasn't been sold in the United States. If the U.S. agrees to buy this kind of school bus bike, it could do a lot of good to improve exercise for a young age and help them keep healthy.Where is the school bus bike designer from?
How many seats does the school bus bike have?
Why are the school buses colored yellow?
How much does the school bus bike cost?
What do you think of the school bus bike?
阅读下列图表，做1-2小题。
The pet sitter will get ___ for working every weekend.
A. ＄30 B. ＄40 C. ＄20What is NOT the pet sitter’s job?
A. Giving food to the dog
B. Taking a walk with the dog
C. Cleaning the dog’s house
阅读下面的图表，做1-3小题。
This picture is probably from ______.
A. a story book B. a math book C a newspaper What’s a “Coupon” used for?
A. To invite a friend
B. To save money
C. To get a VIP cardWhich of the following is NOT true?
A. People can’t go to Sweet Tomatoes for a meal on Monday.
B. People can enjoy delicious chicken and hamburgers in Sweet Tomatoes.
C .First Ten on 2nd Sunday each month can get one free tasty chocolate.
If you’re ready to add more physical activity(体育运动) to your life, here are some tips(建议).
Make physical activity part of your routine, like brushing your teeth or going to work. Try biking to work at least once a week, using the stairs more often, or walking to some places near home. But talk to your doctor before you start an exercise routine, especially if you haven’t been very active or have health problems.
Walking is one of the best fitness(健康) activities. To keep up a routine, you can walk with family members, friends or pets. Count your steps with a step counter(计数器). You can buy one at a sporting goods store. If you don’t have time for one 30-minute walk, break it into three 10-minute walks.
Find an activity that you enjoy, and stay with it. Change it with other activities so you don’t get bored. For example, walk three days a week, and swim or bike on the other days. Join a volleyball or basketball club for fun and exercise. By finding more activities you enjoy, you’ll have a greater chance for success.
The underlined word “routine” probably means “______” in Chinese.
A. 建议 B. 惯例 C. 爱好What does the writer suggest doing before starting daily exercise?
A. Talking to the doctor.
B. Walking to work.
C. Buying a step counter.How many tips does the writer mention when talking about the walking activity?
A. Two. B. Three. C. Four.To avoid getting bored with the same activity, we can ______.
A. break one 30-minute walk into three
B. change the activity we are staying with
C. do the activity with our family membersThe passage mainly talks about ______.
A. the ways to count walking steps
B. some health problems we may face
C. some advice on physical activity
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