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The book is _________. It is worth reading a thousand times.

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People naturally associate the name of Darwin________ the doctrine of evolution.

Last year, the crops suffered ________ serious blights.

During World War II, Washington residents of Japanese descent, including American citizen, were forcibly________ and many experienced serious loss and hardship.

用户研究的方法主要包括哪两类()。

A. 定性
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C. 定量
D. 用户调查