单项选择题

Questions 17～20 are based on the following report about human height. You now have 20 seconds to read Questions 17～20. The report intends to tell us that ______.

A. the change of human height follows a cyclic pattern
B. human height is becoming even more predictable
C. Americans have reached their genetic growth limit
D. the genetic pattern of Americans has changed
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The man is reading a ______ magazine. 1 Cloning parts of a human body to replace ______ or lost parts is possible in the future. 2 Scientists say that if you took the ______ from someone and tried to create a copy of a person,there’s no guarantee that the copy would look or act like the original. 3 Scientists are using material from ______ and animals to create new medicines. 4 The woman thinks it great to use ______ materials rather than man—made ones. 5
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