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【单选题】
为了消除曲轴的扭转振动，有的发动机在曲轴（）处装有扭转减振器。A.
前端
B.
后端
C.
曲拐
D.
曲柄
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【单选题】He cannot be tired _______ he has walked only half a mile.
A.
since
B.
whether
C.
when
D.
as long as
【单选题】Every time Louis is tired, he's edgy. He's edgy today, so he must be tired today.
A.
Valid
B.
Invalid
【单选题】Why does the man like to be a park ranger?
A.
Because he is tired of being an actor.
B.
Because he can have more free time.
C.
Because he likes to be in the open.
D.
Because he loves working in parks.
【单选题】Be quiet, please! Your grandfather _ in the room. He is tired. [ ]
A.
sleep
B.
sleeps
C.
is sleeping
【单选题】Let him______a rest. I think he must be tired after the long walk.
A.
have
B.
gets
C.
to take
D.
has
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