y problems. 68. From the passage , we can know that a boy looks like his parents because . A. he is son of his parents B. his parents ’ DNA decides his appearance C. he has received DNA from his father or his mother D. scientists have put some of his parents ’ DNA into him 69. What does the underlined expression “ let loose ” probably mean ? A. let ... go free B. get rid of( 解决)C. absorb ( 吸收)D. survive 70. What is the best title for the passage ? A. The DN A Research in Japan B.A New Way of DNA Research in Japan C. The Causes and Effects of DNA Research D. The Advantages a nd Disadvantages of RDNA 71. The following statements are true abo ut RDNA research EXCEPT A. the research has been stopped because the created animals carry virus B. super-trees might be widely planted around the world
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