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问题
选择题
________ Tom ________ a volleyball?
A. Does; has
B. Do; have
C. Does; have
D. Do; has
答案
答案:
C
选择题
Mary can play the trumpet
______
she can’t swim. [ ]
A. and
B. but
C. or
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问答题 论述题
什么叫梯度洗脱?它与GC的程序升温有何异同?
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