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【单选题】
You haven’t changed your mind, _______? [ ]A.
do you
B.
are you
C.
have you
D.
did you
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【简答题】下列各物质的分子间只存在色散力的是( )A. B. C. D. HBr E. F. G.
【单选题】在某一化学反应中，反应物A的浓度在20s内从1.0mol/L变为0.2mol/L，则在这20s内以A浓度的变化表示的平均反应速率为（ ）
A.
0.04mol/（L?s）
B.
0.04mol/L
C.
0.08mol/（L?s）
D.
0.08mol/L
【单选题】在某一化学反应中，反应物B的浓度在5 s内从2.0 mol/L变成0.5 mol/L，在这5 s内B的化学反应速率为
A.
0.3
B.
0.3 mol/（L·s）
C.
0.4 mol（L·s） -1
D.
0.04 mol/L
【简答题】__________ is often more difficult to find trained men than to get financial support for scientific research. A． It B. That C. This D. What
【单选题】It is often more difficult to find trained men than ___for scientific research.
A.
getting financial support
B.
to get financial support
C.
get financial support
D.
in getting financial support
【单选题】My brother while he his bike and hurt himself.
A.
had fellen; was riding
B.
fell; were riding
C.
had fallen; rode
D.
fell; was riding
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