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【单选题】
设 N A 为加德罗常数的值。下列说法正 确的是A.
标准状况下，80gSO 3 所占的体积约为22.4L
B.
25℃时，pH=13的1.0LBa(OH) 2 溶液中含有的OH - 数目为0.2 N A
C.
电解精炼铜时，当转移了2 mol电子时，阳极上溶解的铜原子数一定为N A
D.
标准状况下11．2 L NH 3 溶于1 L水中，溶液中含N原子的微粒总数为0.5 N A
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举一反三
【单选题】I'm very busy today. I have a very important report . [ ]
A.
to listen
B.
to listen to
C.
listening
D.
to listening to
【单选题】I'm ______ with the children who constantly bother me when I'm very busy.
A.
happy
B.
surprised
C.
amazed
D.
annoyed
【单选题】—Would you like to come to the party? —______, but I’m very busy preparing for the exam.
A.
I have no time
B.
I’d like it
C.
I’d like to
D.
I’d rather not
【单选题】- Will you come to my birthday party this Sunday? - _________
A.
I'm very busy.
B.
Ok, I don't.
C.
Ok, I do.
D.
Ok, I will.
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