5.已知为非零向量,函数,则使的图象为关于轴对称的抛物线的一个必要不充分条件是( )w_w w. k#s5_
A. B. C. D.
4.在正方体中,M、N为棱AB与AD的中点,则异面直线MN与BD1所成角的余弦值是( ) w_w*w._k s_5@
A. B. C. D.w_w*w._k s_5@
3.已知,则的值是( )w_w w. k#s5_
A. B. C.w_w*w._k s_5@ D.
2.已知Z是纯虚数,是实数,则( )
A.2i B.i C.i D.2i
1.已知集合,则( )
A. B. C. D.
30.We must apply what we have learned to our daily work because in no case_______from practice.
A.should theory separate B.should theory be separated
C.theory should separate D.theory should be separated
29.Little that danger in the earthquake when they were busy saving their students.
A.the teachers realized B.the teachers didn’t realize
C.didn’tthe teachers realize D.did the teachers realize
28.-Where was it ___ _ the earthquake broke out yesterday ? -In an Italian city.
A.where B.which C.how D.that
27.I don't remember how many years ago ______ people began to grow crops.
A. it was when B. it was that C. was it when D. was it that
26.-You should have thanked the hostess before leaving.
-I meant . But I couldn’t find her when I was leaving.
A.to do B.to C.doing D.doing so
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