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第1题

Once environmental damage _________, it takes many years for the system to recover. A.has done B.is to do C.does D.i
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第2题

We are _______ at the rapid progress Mark has made in this semester. 　A. distinguished B.annoyed C.astonished D.score
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第3题

She is already 16years old. But she _______as if she were still a little girl. 　A. believes B.absorbs C.accrses D.beh
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第4题

This river forms a natural _______ between China and Korea. 　A. boundary B.string C.spot D.zone
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