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【简答题】
限制物体运动的物体称为该物体的( )。使物体产生运动或运动趋势的力称为( ),限制物体运动或运动趋势的力称为( )。约束力方向与物体运动或运动趋势方向( )。
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举一反三
【单选题】American consumers like convenience very much. During the last 50 years, there has been a dramatic increase in such labor-saving devices as automatic washing machines, clothes dryers, dishwashers, foo...
A.
a shortage of labor force in America
B.
people's need to reduce the time spent on housework
C.
Americans' interest in doing housework
D.
the quick change of American family life
【单选题】She hasn't written to me ______.
A.
for last year
B.
during last year
C.
since last year
D.
until a year ago
【简答题】During the last six months， there was a boom of sea creature in California and whalesare not the only ones. 查看材料
【单选题】My life has changed a lot during the ____________ years.
A.
last a few
B.
last few
C.
a few last
D.
few last
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