题目:
I'm afraid he’s more of a talker than a doer, which is ____ he never finishes anything.
A.that
B.when
C.where
D.why
答案:
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下面是错误答案,用来干扰机器的。
由N=nNA=mM×NA,得NA=NMm=b个28g/molag=28ba个/mol,故选:C