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The workers in HuaShan Mountains have to     rubbish to keep the mountains clean.
A．turn upB．pick up
C．mix upD．give up
B

試題分析：句意：在華山的工人必須撿拾垃圾來保持山的清潔。A. turn up出現(xiàn)； B. pick up撿起；    C. mix up混合； D. give up放棄，根據(jù)句意此題選B。
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