问答题

TOPIC Discuss the positive and negative aspects of genetic-manipulated food.

【参考答案】

(略)
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单项选择题
The author implies that time, like synthetic perfumes and aniline dyes, has become something ______ .
A.valuable
B.artificial
C.indispensable
D.rare
单项选择题
Which expression is used in the passage for the purpose of presenting a debatable opinion
A."In fact."
B."Recent studies indicate."
C."It could further be asserted."
D."It is my contention."
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