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【单选题】
--_________ can cormorants stay under the water? --_________ up to two minutes.A.
How soon, For
B.
How often, /
C.
How long, For
D.
When ,For
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举一反三
【单选题】Many students do not like to study for tests, ____ do they like to write term papers.
A.
or
B.
nor
C.
and
D.
but
【单选题】All games______ because of the rainstorm, many students could do nothing but study in the classroom.
A.
were canceled
B.
having been canceled
C.
had been canceled
D.
have been canceled
【单选题】用NaOH测定食醋的总酸量，最合适的指示剂是
A.
中性红 （ pK HIn = 7.4 ）
B.
甲基红 （ pK HIn = 5.0 ）
C.
酚酞 （ pK HIn = 9.1 ）
D.
甲基橙 （ pK HIn =3.4 ）
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