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 ________.

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

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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.

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4．Which of the following is true?

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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.