相关考题
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单项选择题
The originally clean river is now seriously polluted and unfit（）.
A.to swim
B.for swimming
C.to swim in
D.for swimming in -
单项选择题
Never（）such a nice chair.
A.has he seen
B.he has seen
C.saw he
D.he saw -
单项选择题
盐酸纯品为澄清无色或微黄色有刺激性气味的液体，一般浓度在（）左右。
A、40%
B、30%
C、50%
