阅读理解。

     Have you ever heard of Florida pompano? It's a flat, silvery fish and very delicious! In fact,

people who know a lot about fish say it's one of the best-tasting kinds of fish in the world to

eat. Maybe that's one reason why it costs so much to buy pompano (鲳参鱼) at the fish market

or at a restaurant.

     Agricultural Research Service scientists in Florida are discovering many new and important

secrets about this tasty fish. It lives in the warm waters off the Atlantic and Gulf coasts.

     The scientists are studying pompano. Because they want fish farmers to be able to grow

them in big tanks, somewhat the same way trout and catfish are grown in big outdoor ponds.

     Raising pompano in big tanks inland could help everyone be sure that there will always be

lots of wild pompano in the sea. People could buy them from the fish farm instead of mostly only

being able to buy pompano caught from the sea.

     Sometimes, if a fish is too popular, a problem called "overfishing" can happen. The fish could

become harder and harder to find in the ocean. The fish might even disappear completely.

     The trouble with pompano is that no one really knows very much about how to grow big,

healthy pompano in big tanks at a fish farm.

     That's why scientists are trying to learn as much as they can about pompano. Maybe someday

soon it will be easy to buy and eat pompano raised at fish farms, instead of pompano fished from

the sea. When that happens, you may remember this story about these scientists who helped find

out how to raise delicious pompano in a new, Earth-friendly way.

1. Pompano costs so much to buy maybe because______.

A. it remains a secret for the scientists.

B. it cannot be raised in big tanks inland.

C. it's the best-tasting kinds of fish in the world.

D. it lives warmly off the Atlantic and Gulf coasts.

2. Paragraph 4 mainly tell us raising pompano at fish farms ______.

A. makes it easier to buy and eat the pompano

B. prevents people catching pompano from the sea

C. stops people buying pompano caught from the sea

D. helps make sure wild pompano will remain in the sea

3. The word "overfishing" in paragraph 5 means ______.

A. 过度捕捞  

B. 太受欢迎    

C. 完全消失    

D. 难以搜寻

4. What's the trouble of raising the big fish?

A. Scientists are still working on it.

B. It's almost a secret to farm the fish.

C. it's impossible to keep the fish healthy.

D. no one knows the way of raising the fish.

5. The best title of the passage may be ______.

A. Pompano: the tasty fish      

B. secrets of the big fish

C. A challenge: growing the big fish

D. the way of raising the big fish