题目内容：

    They’re in restaurants,hotels and homes all over the world. The saltwater aquarium, with its colour fish, bring a piece of the wild into your living room.

But do you really know where those saltwater fish come from? A full 97 percent, yes, almost all kinds of saltwater fish can’t be bred in captivity (人工养殖). They must instead be taken from the ocean. And how is that done?

Most of the time, with sodium cyanide, it is a harmful chemical compound that many fish collectors in the Philippines, Sri Lanka, and Indonesia use to catch fish. They mix it with water and use it on the fish. Stunned, the fish can then be easily caught.

What does cyanide do to the fish? There is a scientific study on cyanide’s effects. When there is cyanide in water, fish lose their balance and have difficulty breathing. Some fish simply die then and there. Many, many more die on the way to captivity.

Although cyanide fishing in the Philippines, Sir Lanka, and Indonesia is not allowed, it sill happens too often. According to the World wildlife Fund, up to 90 percent of the saltwater fish that enter the US each year are caught this way. The Center for Biological Diversity is calling on the US government to avoid these imports.

“Compared to many environmental problems now facing the world’s oceans, this is one that can easily be solved,” said Nicholas Whipps of the Center. “Because the US is such a powerful market player in this industry, the responsibility to stop this practice falls largely on the United State’ shoulders.”

In the Philippines, private planes bring in cyanide to the fisherman and then take away the live fish. Live fish give the fisherman a better life than dead ones, so more and more fishermen have turned from supplying the fish-for-food trade to the fish-for-aquariums trade.

The Center for Biological Diversity hopes the government will use the law to turn away cyanide-caught fish and persuade people to buy those only raised in captivity.

1.What can we lean about cyanide fishing?

A. It is within the law. B. It is the main reason why fish die.

C. It brings death to many fish. D. It causes health problems for fishermen.

2.A fish collector can easily catch saltwater fish when ________.

A. they become sick B. they are swimming in cyanide-filled water

C. they consider cyanide as food D. they get out of breath while trying to escape

3.The underline word “this” in Paragraph 6 refers to _________.

A. importing fish from foreign countries B. using private planes to carry fish

C. overfishing in the ocean D. catching fish with cyanide

4.What does the Center want Americans to do?

A. Say no to cyanide-caught fish. B. Keep cyanide fishing.

C. Stay away from the harmful cyanide. D. Raise more fish in captivity.