Smokers are well of the dangers to their own health,but they simply find it hard to give up. A. sure B. certain C. known D. aware 题目和参考答案——青夏教育精英家教网—

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5. Smokers are well of the dangers to their own health,but they simply find it hard to give up.

A. sure B. certain

C. known D. aware

5. D be well aware of...意为"对....... 充分了解/认识"；be sure of...意为"对……有把握"。

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