根据以下材料，回答下面试题
　　Several fishermen in Maine recently completed a study program at the country's first ever"Cod( 金枪鱼)School." It trains fishermen who usually earn a living fishing in the ocean to be fish farmers.The program is aimed at helping commercial fishers to find a new way to carry out their trade.
　　On a recent morning, a fishing boat left, but the men on the boat were not going fishing,they were going farming.They are going to move the cages and sorting codfish.About one and a half kilometers out to sea, the boat finds eight circular pens.A rubber tube encloses each one.The pens are covered with netting material to keep out seabirds.Inside each of the fifty-meter wide areas are up to fifty thousand cod. Most of these fish will be served on dinner tables around the world.
　　The program will teach the students how to feed the fish and not to over-feed the fish.It means that they should give them enough feed, and not waste any feed and make it as efficient as possible.
　　The fish-farmers in training take turns throwing special fish food into the pen.Air bubbles appear as thousands of cod come up to feed. They can be seen from the boat with an underwater camera.
　　Bill Thompson is one of the Cod School's four students.He says the program has showed him that fish-farming is a wise choice. He said:" Even if the wild stocks came back to their fullest capacity they still wouldn't feed the world. So this is the way of the future. And it's possible for a family to run a business also."
　　第16题 The "Cod School" is a place where_____.
　　A.cod fish are trained B.fishermen learn to grow cod fish
　　C.a large number of cod fish can be found D.cod fish are kept
　　第17题 The program of Cod School is to help_____.
　　A.improve fishermen's working condition B.increase fishermen's income
　　C.reduce cod's time of growth D.fishermen's wayof fishing
　　第18题 In the" Cod School" cod fish are kept in_____.
　　A.rubber tubes B.large boxes C.large cages D.open waters
　　第19题 If the cod fish are over fed,_____.
　　A.they would die soon B.they would be over-weighted
　　C.the feed would be wasted D.the water in thepens would be polluted
　　第20题 The purpose of fish-farming is to_____.
　　A.meet the growing needs of the consumers
　　B.protect the wild cod fish from dying out
　　C.help fishermen run their own business
　　D.teach fishermen about high technology

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