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【多选题】
常温下，pH=9的CH 3 COONa 溶液由水电离出来的C（H + ）为a， pH=9的 NH 3 ·H 2 O溶液由水电离出来的C（H + ）为b，下列a和b的关系正确的是A.
a='b'
B.
a=10 4 b
C.
b=10 -4 a
D.
a=10 -4 b
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【单选题】When she heard the ring, Sharon reached for the phone. 'Call an ambulance!' she heard Kevin saying _________ a choking voice.
A.
at
B.
by
C.
in
D.
with
【单选题】— I heard that there were a lot of shouts and screams at yesterday’s party. It must have been terrible. — Oh, no. ________, I enjoyed every minute.
A.
On the contrary
B.
In the end
C.
As a result
D.
On the other hand
【单选题】. She insisted that she ______ somebody in the house.
A.
should hear
B.
heard
C.
hear
D.
was heard
【单选题】She was working in the room suddenly she heard a boy crying and ____ out as quickly as she could to see what was happening.
A.
went
B.
going
C.
go
D.
had gone
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