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【简答题】
在制剂中常作为金属离子络合剂使用的有( ) 。 A. 碳酸氢钠 B. 焦亚硫酸钠 C. EDTA-2NA. D. 硫代硫酸钠
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【单选题】A typical instant-messaging conversationlasts ________. A.at least one hour B.more than one hour C.at least half an hour D.more than one place
A.
at least one hour
B.
more than one hour
C.
at least half an hour
D.
more than one place
【单选题】—Sally never comes late, ______she? —No. She is always the first one to come to school. [ ]
A.
doesn't
B.
isn't
C.
is
D.
does
【简答题】A．Half an hour. B．One hour. C．One hour and a half. D．Two hours.
【单选题】Winning a gold medal in the Asian Games is an unforgettable moment for her，________she will never forget. [ ]
A.
that
B.
what
C.
it
D.
one
【简答题】A．Two hours by train. B．One hour by bus. C．One hour by train. D．One hour by car.
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