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

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

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.

　　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.

(　　)

A big, mighty(高大的) tree stood in a forest. Its branches(树枝) spread out and its roots (根) went deep in the earth. A lot of people came here to have a rest under it. And a lot of birds stood on its branches to sing and dance. The big tree was very proud all the time.
At the foot of the tree, there was a little plant. The plant was thin, and seemed to be blown down by any of a little wind.
One day, the two neighbors were having a little chat.
“Well, little one,” said the tree to the plant, “why not put your feet deeply in the earth, and raise your head high in the air as I do?”
“I see there is no need to do so,” said the plant with a smile. “In fact, I think I may be safer in this way.”
“Safer?” said the tree. “Are you safer than I am? Do you know how deep my roots are in the earth and how strong my branches are? Who can possibly pull me out by the roots or bow my head to the ground?” And the tree didn’t want to say anything to the weak plant.
But the tree was to regret its words very soon. One evening, a great hurricane(飓风) came. It blew the trees off their roots and almost destroyed the forest completely. It uprooted（将……连根拔起）the mighty tree and blew it away with great force.
When the storm had gone, the villagers living nearby came to check the damage. The mighty tree lay on the ground, but the little plant still stood there.
【小题1】Who was the big tree’s neighbor?

A．People.

B．Birds.

C．A little plant.

D．Branches.

【小题2】Why was the big tree proud before its neighbor?

A．Because a lot of people came to have a rest under it.

B．Because it was tall and thick.

C．Because a lot of birds stood on its branches to sing and dance.

D．All of the above.

【小题3】Why didn’t the big tree want to say anything to the little plant?

A．Because the big tree was tired.

B．Because the little plant knew less than the big tree.

C．Because the strong wind came.

D．Because the big tree looked down upon(看不起)the little plant.

【小题4】What did the villagers living nearby see after the hurricane had gone?

A．They saw the forest was flooded.

B．They saw the big tree lying on the ground.

C．They saw the big tree was still mighty.

D．They saw some birds singing on the little plant.

【小题5】 What’s probably the best title of the passage?

A．Trees in the Forest.	B．A Mighty Tree.
C．Trees and Plants.	D．A Clever Plant.