单项选择题
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A.He liked writing when he was a child
B.He enjoyed reading stories in Reader’’s Digest
C.He used to be an editor of Reader’’s Digest
D.He became well known at the age of six
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单项选择题
The author’’s main purpose in writing this passage is to ______.
A.discuss the negative effects of patenting genes
B.face possible moral consequences of patenting genes
C.condemn the selfishness of researchers who patent genes
D.weigh the advantages and disadvantages of patenting genes
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单项选择题
One of the major difficulties of research into human health problems is the difficulty of ______.
A.knowing how many factors there are
B.isolating particular, individual factors from the complex human environment
C.knowing the complex human environment
D.increasing the number of the competent physicians
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