【单选题】
锅炉与墙壁之间至少留有___的间距。
A. 20cm
B. 30cm
C. 50cm
D. 70cm
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答案
D
解析
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( ) 26. Where does the writer of "The little Prince" come from?
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【单选题】
( ) 37.The greatest river for navigation is ___________.
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【单选题】
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【单选题】
( ) 40. The best title of the passage is ___________.
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