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【单选题】
ρB和cB之间的换算关系为A.
ρB=cB×MB
B.
ρB=cB×mB
C.
cB=MB／ρB
D.
cB=ρB×mB
E.
CB=ρB×MB
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【单选题】Jim's sister gave him a gift that would enable him ______
A.
to go to the local veterinarian
B.
not to worry about his dog
C.
to take care of his dog
D.
to do check-ups on his dog
【单选题】You must ______ your cigarette when you are at the gas station.
A.
put down
B.
put on
C.
put off
D.
put out
【简答题】酶促反应速度受许多因素影响,这些因素主要有______、______、______、______、______和______等。
【单选题】Although you have lots of difficulties, you must ______your work.
A.
carry out with
B.
carry away on
C.
carry on with
D.
carry over
【单选题】_______ you begin the work , you must carry it out through to the end.
A.
When
B.
Though
C.
Sometimes
D.
Once
【单选题】He says, you must take in those responsibilities.
A.
take away
B.
take on
C.
take out
D.
take off
【单选题】The criminal gave us a long chase before we caught him.
A.
trial
B.
pursing
C.
pursuit
D.
running
【单选题】You must ______________. [ ]
A.
to put on them
B.
to put them on
C.
put them on
D.
put on them
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