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【单选题】
在0.1 mol/L的NH 3 ·H 2 O溶液中，下列关系正确的是（ ）A.
c(NH 3 ·H 2 O)>c(OH - )>c(NH 4 + )>c(H + )
B.
c(NH 4 + )>c(NH 3 ·H 2 O)>c(OH - )>c(H + )
C.
c(NH 3 ·H 2 O)>c(NH 4 + )=c(OH - )>c(H + )
D.
c(NH 3 ·H 2 O)>c(NH 4 + )>c(H + )>c(OH - )
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【简答题】听下面一段对话，完成第1至2题。 1. Who is supposed to attend the meeting? A. Sam. B. John. C. Tom. 2. When does the meeting start? A. At 3:30. B. At 3:15. C. At 3:00.
【单选题】Peter was so excited _______ he received the invitation to the important meeting.
A.
that
B.
though
C.
when
D.
before
【单选题】Could you tell me_______ yesterday afternoon?
A.
when the meeting ended
B.
when did the meeting end
C.
when ended the meeting
D.
when the meeting did end
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