78．There are still some trees——青夏教育精英家教网—

完形填空。

     There are seas, lakes and forests on the earth. There are cities, towns and farms, too. All these things
are environments. The environment is everything around you. It can be living (有生命的), like a forest.
It can be non-living (无生命的),   1   a rock or a mountain.
     No living thing can live alone. Every living thing depends (依赖于) on other things in its environment.
When something   2 , it affects (影响) something else. If a non-living; thing like water becomes   3   to
find, plants will be affected. If all plants   4 , the animals that eat plants will be affected.
     Weather, such as temperature, wind and rain, can change an environment.   5   can change an
environment, too. Some things that people do cause no change or only a small change in the environment.
For example, people can walk through the forest and just travel around. They can cut down only a few
trees and   6   change the environment very much. On the other hand, some things that people do
cause   7   changes. Sometimes they can change a whole environment by cutting down a forest.
      Not all changes are bad. If we cut down a forest to build houses or plant crops, this may not be bad.
But what would happen if we cut down all trees in all forests or if we didn't   8   them and plant something
else?
     It is clear that people are able to change an environment. This is why it is important to think about the
changes before we make   9 . Let's work together to  10  it clean and healthy.

(     )1.A. with
(     )2.A. lives
(     )3.A. dry
(     )4.A. live
(     )5.A. Those
(     )6.A. still not
(     )7.A. little
(     )8.A. use
(     )9.A. it
(     )10.A. change

B. like
B. becomes
B. difficult
B. lose
B. Plants
B. still
B. a lot of
B. build
B. them
B. keep

C. on
C. changes
C. easy
C. die
C. People
C. even
C. a small
C. save
C. that
C. have

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完形填空

　　There are seas, lakes and forests on the earth. There are dries, towns and farms, too. All these things are environments. The environment is everything around you. It can be living, like a forest. It can be non-living, __1__ a rock or a mountain.

　　No living thing can live alone. Every living thing depends on（依靠）__2__ things in its environment. When something changes, it affects something else. If a non-living thing like water becomes __3__ to find, plants will be affected（影响）. If all plants die, the animals that eat plants will be affected.

　　Weather, such as temperature, wind and rain, can change an environment. __4__ can change an environment, too. Some things that people do cause no change or only a small change in the environment. For example, people can __5__ the forest and just travel around. They can cut down only a few trees and still not change the environment very much.

　　On the other hand some things that people do cause __6__ changes. Sometimes they can change a whole environment by cutting down a forest.

　　__7__ changes are bad. If we cut down a forest to build houses or plant crops, this may not be bad. But what would happen if we cut down all trees in all forests __8__ these things or if we didn't save some and plant something else?

　　It is clear that people are able to __9__ an environment. This is why it is important to think about the changes before we make them. Let's all work together to __10__ it clean and healthy.

(1) A．with	B．like		C．on
(2) A．all	B．its		C．other
(3) A．less	B．easy		C．difficult
(4) A．Plants	B．Animals		C．People
(5) A．walk through		B．cut down
C．find out
(6) A．little	B．a lot of		C．a small
(7) A．Not all	B．Not every		C．All
(8) A．to do	B．doing		C．does
(9) A．develop	B．break		C．change
(10) A．change	B．keep		C．have

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Many years ago，there were lots of trees on earth，because summer lasted a whole year．What was the forest like? It is not difficult to see，because parts of that ancient（古老的）forest still stand．It is the rainforest．Here，even in a sunny day water drops through the leaves．

Today's largest rainforest is in South America．It covers about a million square miles．All the trees are very tall；the young trees are nearly sixty feet high．But it is not easy for some to grow higher because very little sunlight leaches them．

Many trees are about 60 to 120 feet high．Some are even taller．The tallest trees can be 200 feet high．

In this forest of tall trees，plant life is rich，animal life is rich，too．At different heights live different animals and many different noises can let you know where they are．

根据短文内容，选择最佳答案。

1．There were lots of trees on earth many years ago because of the _________．

A．cold weather B．largest forest C．warm weather D．rainforest

2．A rainforest has enough _________．

A．trees B．rainfall（雨量） C．forest D．leaves

3．There is rainforest _________．

A．only in South America B．only in the old days

C．in some parts of the world D．below the sea

4．Young trees share little sunlight because _________．

A．tall trees are above them B．there isn't enough sunlight

C．they needn't much sunlight D．it is summer the whole year

5．You can always find different animals by _________．

A．their colors B．the noises they make

C．climbing the trees D．watching them carefully

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阅读理解

　　Scientists are trying to make the deserts（沙漠）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 very 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 hot sun make the earth even drive. Plants don't let the wind blow the dirt（泥土）away. When a little of（一点儿）rain falls, the plants hold the water. Without plants, the land can become a desert much more easily.

(　　)(1)Plants can keep dry land from becoming desert

(　　)(2)It is good to get rid of（消除）the grass in the desert

(　　)(3)All places without much rain will become deserts.

(　　)(4)It's important for us to plant trees and protect（保护）forests.

(　　)(5)Scientists may not be able to change the desert in time.

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　　In these years, northern China is often hit by sandstorms. One of the reasons is that people are still cutting down more and more trees. As a result, a lot of good land has gone with them, leaving only sand.

　　People suffered（遭受）a lot from sandstorms. When they came, car and bus drivers had to drive slowly：they could hardly see the road in front of them even during the day-time. In the year 2000, a very strong sandstorm happened in a certain city. It was one of the worst sandstorms that lasted nearly 2 hours. People couldn't see their hands before them. The streets were almost empty. The smell from the sandstorm was very bad. Some people disappeared in the sandstorm.

　　Luckily, people in China begin to understand the terrible result. The Chinese government and people are trying their best to fight against sandstorms. They not only stop the people from cutting down trees, but plant more and more trees everywhere.

　　Now, China has built the Great Wall across the northern part of the country. It will stop the wind from blowing the earth away. It will stop the sand form moving towards the rich farmland in the south. It has already saved a lot of land. But more “Great Green Walls” are still needed. They hope in a few years' time the whole country will be covered by forests.

(1) In 2000, there was a strong sandstorm in a town.

(　　)

(2) People can't do anything to do with the sandstorm.

(　　)

(3) In ten years' time, China will may be covered by forests.

(　　)

(4) Sandstorms may be caused by people.

(　　)

(5) Chinese build the Great Wall across the western part.

(　　)

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