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【单选题】
两个完全相同的交流铁心线圈，分别工作在电压相同而频率不同（f1>f2）的两个电源下，此时线圈的电流I1和I2的关系是A.
I1>I2
B.
I1
C.
I1=I2
D.
I1和I2的大小无关
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【单选题】O'Neal works hard. He is often seen _______ heavily before his teammates have even arrived at practice.
A.
sweated
B.
to be sweated
C.
sweating
D.
being sweated
【单选题】( )(改编)Stephen often practices English________ chatting with his American friend.
A.
in
B.
by
C.
for
D.
with
【单选题】Stephen: I want to send this package parcel post, registered. Clerk: ______ ? Stephen: Yes, please, for sixty dollars.
A.
Do you want it guaranteed
B.
Do you want it insured
C.
Do you want it preserved
D.
Do you want it ensured
【单选题】We should often practi c e _________ English with each other.
A.
to speak
B.
spoke
C.
speak
D.
speaking
【单选题】(改编题)Stephen often practices English________ chatting with his American friend.
A.
in
B.
by
C.
for
D.
with
【单选题】Stephen often practices English_____ chatting with his American friend.
A.
in
B.
by
C.
for
D.
with
【简答题】______ she first heard of the man referred to as a specialist. A) That was from Stephen B) It was Stephen whom C) It was from Stephen that D) It was Stephen that
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