单项选择题

We hdn’t seen ech other for yersnd he hd chnged gret del, so I didn’t _______ himt firsWe

hdn’t seen ech other for yersnd he hd chnged gret del, so I didn’t _______ himt first.relize B．repet C．know D．rec ognizeA．realizeB．repeatC．knowD．rec ognize

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单项选择题

lthough we hdn’t seen ech other for twenty yers, I recognized him______I sw him.the moment

B．.lthough we hdn’t seen ech other for twenty yers, I recognized him______I sw him.the moment B．suddenly C．by the moment D．quicklyA．the momentB．suddenlyC．by the momentD．quickly

多项选择题

下列试剂不是碱的是（）

A.Py
B.DMSO
C.DMAP
D.TEA