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【判断题】
已知任意两个向量 ,不等式 是正确的吗?A.
正确
B.
错误
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【单选题】Jack wasn’t saying anything，but the teacher smiled at him________he had done something very clever. (2011·湖南，33)
A.
as if
B.
in case
C.
while
D.
though
【单选题】Jack wasn’t saying anything, but the teacher smiled at him _______ he had done something very clever.
A.
as if
B.
in addition
C.
when
D.
though
【单选题】Jack wasn’t saying anything, but the teacher smiled at him _______he had done something very clever.
A.
as if
B.
now that
C.
while
D.
though
【单选题】If every student who was in the eleventh grade in 1996 and who used a computer in school at least once a week used a computer at least once a week in 1997, and if 20% of those students who were in the...
A.
40%
B.
50%
C.
60%
D.
70%
E.
80%
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