The world is filled with many interesting sounds. Some are very pleasant to hear; others are unpleasant to our ears. In a day, you probably hear hundre
ds of different sounds.
All sounds are different. Some may be soft; others may be loud. Some sounds are high; others are low.
Some sounds are useful. Without sound we c
annot talk or listen to one another. The ringing alarm clock (闹钟)makes people wake up. The hooting of a horn (喇叭声) on the road warns careless people of danger.
We make sounds by making things move to and fro(来回地). This to-and-fro movement is called vibration (振动). It means moving up and down or forwards(向前地) and backwards(向后的) very fast. This makes sound waves(波).
We can make sounds in many ways, for example, by shouting, clapping our hands and striking the table. We can make sounds only by making things vibrate. We can talk because we can make our vocal cords (声带) vibrate. Our vocal cords are in a sound box or voice box. Two vocal cords vibrate when our lungs(肺) force the air through them. We can make sounds ______.
| A．by making things still |
| B．by making things vibrate |
| C．by making things jump up and down |
| D．by changing the positions of things |
Some sounds are useful because ______.
| A．they can wake people up |
| B．they can warn people to be careful when they are crossing the road |
| C．they make it possible for people to talk or listen to each other |
| D．all of the above |
When the air is through our vocal cords, it can make them ______.
| A．vibrate | B．breathe the air |
| C．talk to each other | D．move forward and backward |
Sounds are different because ______.
| A．different sounds have different vibrations |
| B．different sounds have different sound waves |
| C．different sounds have different vocal cords |
| D．both A and B |
Surtsey was born in 1963.Scientists saw the birth of this island. It began at 7.30 a.m. on 14th November. A fishing boat was near Iceland. The boat moved under the captain's（船长）feet. He noti
ced a strange smell. He saw some black smoke. A volcano（火山）was breaking out. Red-hot rocks, fire and smoke were rushing up from the bottom（底部）of the sea. The island grew quickly. It was 10 meters high the next day and 60 meters high on 18th November.
Scientists flew there to watch. It was exciting. Smoke and fire were still rushing up. Pieces of red-hot rock were flying into the air and falling into the sea. The sea was boiling and there was a strange light in the sky. Surtsey grew and grew. Then it stopped in June 1967.It was 175 meters high and 2 kilometers long. And life was already coming to Surtsey. Plants grew. Birds came. Some scientists built a house. They want to learn about this young island. A new island is like a new world.Surtsey is ______.
| A．an island not far from Iceland | B．a new volcano |
| C．a fishing boat | D．a place in Iceland |
When did scientist fly there to watch?
| A．Before the volcano broke out. | B．As soon as the volcano broke out. |
| C．About four days after the volcano broke out. | |
| D．After the volcano stopped rushing up. |
Put the following sentences in correct order.
a. The captain found the boat was moving. b. A new island appeared in the sea.
c. Fire, smoke and rocks were seen rushing up. d. A fishing boat was near Iceland.
e. The island grew quickly.
| A．d-a-c-b-e | B．a-b-c-d-e | C．a-b-e-c-d | D．b-e-d-a-c |
When was Surtsey born?
| A．1964 | B．1963 | C．1962 | D．1965 |
Scientists are trying to make the deserts into good land again. They want to bring water to the deserts， so people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming desert all the time. Scientists may not be able to change the desert in time.
Why is more and more land becoming desert？ Scientists think that people make deserts. People are doing bad things to the earth.
Some places on the earth don’t get much rain. But they still don’t become deserts. This is because some green plants are growing there. Small green plants and grass are very important to dry places. Plants don’t let the sun make the earth even drier. Plants do not let the wind blow(吹) the dirt away. When a bit of rain falls， the plants hold the water. Without plants， the land can become desert more easily. Deserts ________.
| A．never have any plants or animals in them |
| B．can all be turned into good land before long |
| C．are becoming smaller and smaller |
| D．get very little rain |
Smallgreenplantsareveryimportanttodryplaces because __________.
| A．they don’t let the sun make the earth even drier |
| B．they don’t let the wind blow the soil away |
| C．they hold water |
| D．All of the above. |
After reading this passage, we learn that __________.
| A．plants can keep dry land from becoming desert |
| B．it is good to get rid of the grass in the deserts |
| C．all places without much rain will become deserts |
| D．it is better to grow crops on dry land than to cut them |
“Cheese” — a metaphor (隐喻) for what we want to have in life，whether it is a job, a relationship, or money.
Each of us has our own __26__of what cheese is, and we want to __27__it because we believe it makes us __28__.
Once there lived four little characters. Two were __29__named Sniff and Scurry and two were little people named Hem and Haw.
Every morning, the mice and the little people __30_their running wear and went to Cheese Station C __31__they found their cheese. It was such a large store(仓库) of cheese that Hem and Haw __32__moved their homes to be closer to it.
One morning, Sniff and Scurry arrived at Cheese Station C and discovered there was __33__cheese. They weren’t surprised. __34__they had noticed the supply 35 cheese had been getting smaller every day; they were prepared for the result. They set out quickly to __36__new cheese.
Later that same day, Hem and Haw arrived. “What? No cheese! Who moved my cheese?” Hem yelled(叫喊). They went home that night __37__and discouraged.
The next day Hem and Haw __38__to Cheese Station C. But the situation hadn’t changed. Haw asked, “Do Sniff and Scurry know something we don’t know?” Hem __39__him and said, “What would they know? They are simple 40 and we are human beings. They cannot be __41__than we are.”
Haw suggested, “Maybe we should 42 talking about the situation and just to look for some new cheese.”
Haw decided to 43 Cheese Station C while Hem was more comfortable staying in the cheese less Station C.
Meanwhile, Sniff and Scurry went farther 44 they found Cheese Station N. They found what they had been looking for. It was the biggest 45 of cheese the mice had ever seen.
A．feeling B．idea C．worry D．hope
A．get B．avoid C．follow D．try
A．happy B．angry C．full D．worried
A．humans B．dogs C．mice D．cats
A．put in B．took off C．gave in D．put on
A．where B．that C．which D．what
A．firstly B．suddenly C．finally D．always
A．some B．no C．any D．much
A．For B．If C．Though D．Since
A．with B．of C．for D．to
A．search for B．find C．look after D．discover
C．walked D．ran
A．smiled at B．laughed at C．thought of D．praised
A．animals B．cheese-lovers C．thieves D．Sniff and Scurry
A．more foolish B．bigger C．smarter D．faster
A．start B．stop C．get D．enjoy
A．leave B．go C．move D．start
A．if B．unless C．when D．until
A．store B．factory C．company D．Home
粤公网安备 44130202000953号