阅读下面短文并根据短文内容，从短文后面每题所给的选项中选择最佳答案。

　　My uncle lives in New York City. He likes fishing. Every summer he goes fishing in the Adirondack Mountains.

　　One day this summer he took me to one of the beautiful lakes here. The sun was shining in the blue sky over the lake. My uncle caught some big fish, but I could not catch any. He said, “When I was a child, I caught a lot of fish here. But now there aren't many fish. In some of the lakes there are no fish at all.”

　　Then one day I read an article about acid(酸的) rain in a magazine. I learned many things. Gases(废气) from factories and cars go up into the sky, and the wind carries them far away. Later they come down with the rain in other places. That a acid rain.

　　Fish eggs and young fish are killed by even a little acid in the water. Today there are no fish in about 200 lakes in the Adirondack Mountains.

　　Acid rain is becoming a big problem all over the world today. Canada and some countries in northern Europe have the same problems. In Canada, for example, a lot of trees are dying(枯死) because of acid rain.

　　At the end of the article the writer says, “When I stand here and look at these lakes after ten years, what will I see and hear? Will fish jump again? Will birds sing their happy songs? Or will it be a silent spring?”

　　What should we do to stop acid rain? Is it too late now? No, I do not think so. All of us should work together to stop acid rain.

1．There are no fish in many lakes because of ________.

[　　]

2．The writer knows why fish eggs and young fish are killed with the help of ________.

[　　]

3．Choose the right order to tell us how fish are killed.

a．Gases go up into the sky.

b．Acid rain falls into the river.

c．Fishes die in the river.

d．Gases come from factories.

e．The wind carries gases far away.

[　　]

4．Which of the following is true?

[　　]

A．It's too late to stop acid rain.

B．All the fish will die in ten years.

C．Acid rain helps trees to grow.

D．Acid rain can also kill a lot of trees.

阅读理解

阅读下面短文，根据短文内容选择最佳答案．

　　If we find a bird nest, we will have a good place of observing(观察) and knowing about birds.

　　Birds sit on eggs and take care of their baby birds from April to June. Because the baby birds are too young to leave the nest, mothers often leave and come back to the nest during the time to look for food. So it is good to observe birds. When we observe birds, we'd better hide(躲藏) ourselves in a close place to the nest, and it's better to use binoculars(双筒望远镜).

　　But how to make a bird nest? Picture ① and Picture ② are two kinds of bird nests. Picture ③ gives you some other kinds of bird nests. They are very easy to make. If you want to make one, please follow these:

　　Making a nest: A good nest must be very fine, strong, thick and easy.

　　a) Each nest must have six boards. Don't make the boards too slippery(光滑).

　　b) Dig a small hole in the front of the nest as a door. The “door” is from 3cm to 5cm. So the bird can fly in or out easily.

　　c) Make sure the rainwater doesn't go into the nest.

　　d) One piece of the boards should be easy to open.

　　e) Please don't forget to colour the nest.

1．The most important thing in observing birds is ________.

[　　]

A．to write down notes every day

B．to climb trees

C．to look for a place near the nest

D．to make a bird nest

2．When we're observing birds, we have to hide ourselves ________.

[　　]

A．to catch the birds at last

B．to look after them

C．to use the binoculars

D．to make them do everything as usual

3．If we make the nest too slippery, ________.

[　　]

A．it's not very beautiful

B．it's not easy to make

C．it's not strong

D．it's very difficult for birds to hold or stand on

4．We should leave a hole in the front of the nest so that ________.

[　　]

A．the birds can fly in or out

B．we can clean the nest

C．it's easy to make

D．we can hang it easily

5．What's the title(题目) of this passage?

[　　]

A．Listening to the songs of birds.

B．Observing birds and making bird nests.

C．Playing with the birds.