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问题
解答题
12个苹果与一只小兔的重量相等，1只小兔与3只鸽子的重量相等，一只鸽子与几个苹果的重量相等？
答案
一只鸽子与4个苹果重量相等
选择题
The _____ look on his face showed that he hadn't expected it.
A. astonished
B. astonishing
C. being astonished
D. having astonished
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判断题
埋弧焊接过程中和清扫焊剂时会产生烟尘，焊工应带到好防护口罩（）.
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