The earth is about 4,600 million years old. Modern man has lived on the earth for only 35,000 years, but during that time, we have changed our planet in many ways. Many of the things that we have done are good, but more are not good for the earth.

Water pollution

A lot of people, birds and fish die each day because of water pollution. Factories have polluted the land and the water. As a result, many rivers and lakes are now dead.

Air pollution

In big cities, factories, as well as cars, trucks and buses are the main cause of air pollution. Many people in cities now have serious health problems. For example, Mexico city used to be a beautiful sunny capital, but today it is always covered by thick brown clouds.

Soil pollution

In order to have a good harvest, most of the farmers use chemicals too much in their fields. That’s bad for the soil. But this kind of pollution is difficult to stop.

Hope for the future

These problems are very serious for our future, so all of us should do something to improve our environment. If we can stop pollution, our planet will become more and more beautiful and our health will be better. Let’s be greener people!

(   56._____ have made the earth change a lot.

A.Human beings       B.Animals              C.Plants                D.People in other planets

(  )57.There are _____ kinds of pollution in this passage.

A.two                            B.three                  C.four                   D.five

(   )58.Pollution isn’t a big problem now, is it?

A.Yes, it is.              B.No, it isn’t.         C.Yes, there is.       D.No, there isn’t.

(   )59.Which sentence is NOT right according to the passage?

A.Most of things that we have done are good for our planet.

B.We must stop the factories from pouring waste water into the rivers and lakes.

C.Because of water pollution, many rivers and lakes are now dead.

D.Water pollution is very serious nowadays.

(   )60.Which sentence is RIGHT?

A.Though Mexico city is always covered by thick brown clouds, it’s still a beautiful sunny capital.

B.Air pollution can make people sick.

C.Now fewer farmers use chemicals in the fields.

D.Factories, cars, trucks and buses are the main cause of soil pollution.

Why do plants grow in some places and not in others? Why does some land have so much growing on it, while other land has almost no plants growing on it at all?

To grow, plants need several things. One is warmth. In very cold places almost nothing grows. Plants also need water. In very dry parts of the Earth only a few unusual plants can grow. That’s why dry deserts everywhere are almost not covered by trees or grass.

Plants must also have a place in which to put down their roots and grow. They find it difficult to grow on hard land. The town is built on hard land. The plants here have only the soil (土壤)found between the cracks of the stones to grow in.

Another thing plants must have before they can grow is food.

What will happen if we try to make things grow on the sandy beach? A few plants, such as beach grass, will grow in sand, but most plants won’t. Even if the weather is warm enough and we water the plants each day. Many of them will die because the sand on this beach has almost no food for plants.

1.According to the passage, plants need _____ things to grow well.

A．two              B．three             C．four              D．five

2.What does the underlined word “cracks” mean in the text?

A．缝隙             B．表面             C．夹层             D．底部

3.From the passage, we can know it is _______ for plants to grow in dry places.

A．easy             B．difficult           C．impossible         D．important

4.The reason why most plants can’t grow on the sandy beach is that _______.

A．there isn’t enough sunlight               B．there is too much water

C．it is too crowded there                   D．it has little food for plants

5.The passage can most probably be found in a ______ book.

A．science           B．history            C．travel            D．math

Why do plants grow in some places and not in others? Why does some land have so much growing on it, while other land has almost no plants growing on it at all? To grow, plants need several things. One is warmth. In very cold places almost nothing grows. Plants also need water. In very dry parts of the Earth only a few unusual plants can grow. That’s why dry deserts everywhere are almost not covered by trees or grass. Plants must also have a place in which to put down their roots and grow. They find it difficult to grow on hard land. The town is built on hard land. The plants here have only the soil found between the cracks of the stones to grow in. Another thing plants must have before they can grow is food.  What will happen if we try to make things grow on the sandy beach? A few plants, such as beach grass, will grow in sand, but most plants won’t. Even if the weather is warm enough and we water the plants each day, many of them will die because the sand on this beach has almost no food for plants.

1．According to the passage, plants need ______ things to grow well.

A．two         B．three        C．four                 D．five

2．What does the underlined word "cracks" mean in the text?

    A．缝隙          B．表面        C．夹层                   D．底部

3．From the passage, we can know it is _______for plants to grow in dry places.

      A．easy             B．difficult            C．impossible    D．important

4．The reason why most plants can’t grow on the sandy beach is that _______.

    A．there isn’t enough sunlight               B．there is too much water

    C．it is too crowded there                 D．it has little food for plants

5．The passage can most probably be found in a ______book.

    A．science                 B．history           C．travel          D．math

Why do plants grow in some places and not in others? Why does some land have so much growing on it, while other land has almost no plants growing on it at all?

To grow, plants need several things. One is warmth. In very cold places almost nothing grows. Plants also need water. In very dry parts of the Earth only a few unusual plants can grow. That's why dry deserts everywhere are almost not covered by trees or grass.

Plants must also have a place in which to put down their roots and grow. They find it difficult to grow on hard land. The town is built on hard land. The plants here have only the soil found between the cracks of the stones to grow in.

Another thing plants must have before they can grow is food.

    What will happen if we try to make things grow on the sandy beach? A few plants, such as beach grass, will grow in sand, but most plants won't. Even if the weather is warm enough and we water the plants each day, many of them will die because the sand on this beach has almost no food for plants.

1.   According to the passage, plants need ______ things to grow well.

   A. two                    B. three                   C. four                          D. five

2. What does the underlined word "cracks" mean in the text?

   A. 缝隙                B. 表面                  C. 夹层                        D. 底部

3. From the passage, we can know it is           for plants to grow in dry places.

   A. easy                 B. difficult               C. impossible                 D. important

4. The reason why most plants can't grow on the sandy beach is that _______.

   A. there isn't enough sunlight                 B. there is too much water

   C. it is too crowded there                      D. it has little food for plants

6.   The passage can most probably be found in a ______book.

   A. science               B. history                     C. travel                       D. math