B.They have been used in genetic studies for 20 years.
C.They are the only vertebrates used in cloning.
D.Their survival rates are increased by the new method of cloning.
【解析】 根据第五段最后的“...the number of cloned fish is increased by 15 percent.”可以知道,这种新的克隆技术可以大大提高克隆斑马鱼的成活率。【答案】 D________.a kind of vertebrate
C.their genes can be changed
D.their eggs are easy to observe
【解析】 根据第六段的“What makes zebra fish so useful in research is that their eggs are transparent,making the fish's development easy to follow.”可知人们之所以选择斑马鱼进行基因研究是因为它们的卵是透明的,利于观察。【答案】 D,how many zebra fish can be cloned by the new one?B.23.C.17.D.15.【解析】 根据第五段的最后一句话“With the new technique,the number of cloned fish is increased by 15 percent.”可知答案为B项。【答案】 BB.A study of a new way to clone zebra fish.
C.A breakthrough in research into human health.
D.Zebra fish,the best model for genetic research.【解析】 通读全文可以知道,作者是在介绍一种比较新的克隆斑马鱼的研究,因此B项符合题意。【答案】 B阅读填句(2017·吉林省)The sea has always interested man. From it they can get food, minerals, and treasure.__1__But he could not go far beneath its surface.__2__ However, he is not a fish. He must breathe air, so he can't stay under the water's surface for any length of time. To explore deep water, man faces even more dangers and problems. A diver who wants to stay under water for more than a few minutes must breathe air or a special mixture of gases.__3__He can carry a tank of air on his back and breathe through a nose and mouth piece. Water weighs 800 times as much as air. Tons of water pushes against a diver deep in the sea.__4__ When a diver is under great pressure, his blood takes in some of the gases he breathes. As he rises to surface, the water pressure less. If the diver rises too quickly, the gases in his blood form bubbles (气泡). The diver is then suffering
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