◎ 题干
The workers in the Huashan Mountains have to      rubbish to keep the mountains clean.
[     ]
A. turn up          
B. pick up        
C. mix up  
D. give up
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The workers in the Huashan Mountains have torubbish to keep the mountains clean.[ ]A. turn upB. pick upC. mix upD. give up…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。