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From the text, we can see that, towards the research on this issue, the writer seems

A.convinced.
B．optimistic.
C．ignored.
D．negative.

【参考答案】

D
从文中我们可以看出，作者对有关这一问题的研究的态度是[A]信服的。[B]乐观的。[C]忽视的。[D]否定的。......

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