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【单选题】
根据煤的挥发分产率可大致判断煤的（）程度。A.
氧化
B.
还原
C.
煤化
D.
风化
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举一反三
【单选题】When we don’t know the different ways languages are used in different cultures，we＿＿＿make serious mistakes．
A.
shall
B.
must
C.
could
D.
should
【简答题】It is interesting to visit another country, but there are sometimes problems when we don't know the very well. It may be to talk with the people there. We may not know how to use the telephone in the ...
【简答题】When we don ' t know the different ways languages are used in different cultures, _______we make serious mistakes. [A]shall [B]must [C]could [D]should
【单选题】In this new city, we everyone will meet the _____ when we don’t know what to do.
A.
occasion
B.
statement
C.
place
D.
information
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