A.100 years
B.60 years
C.50 years
D.10 years
答案 C [细节理解题。根据第一段中的“the successful cloning of a mammal would happen within 50 years,and that ‘maybe the same answer is appropriate’ for the step to human cloning”可知,克隆人类或在未来50年内变成现实。故选C。]
22.According to the text,which statement is NOT true?
A.Louise Brown is the first “test tube baby”.
B.Human cloning is still a controversial topic.
C.Sir John is positive about the future of human cloning.
D.Human cloning is creating something that didn't exist before.
答案D [细节理解题。根据第二段第二句中的“became widely accepted after the birth of Louise Brown,the first ‘test tube baby’”可知,Louise Brown是第一个试管婴儿,所以A项正确;根据第二段第一句中的“Although any attempt to clone an entire human would raise complex moral issues”可知,克隆人类仍然是一个存B项正确;根据第二段Sir John所说的话“Well,it could be anywhere between...how about 50 years?”可知,他对未来克隆人类的发展是肯定的,所以C项正确。根据第二段最后一句“...doctors would therefore simply be ‘copying what nature has already produced’.”可知,克隆人类是复制已存在的人类,所以D项不正确。故选D。]
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