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【判断题】
自然循环的自动补偿能力对水循环的安全有利,这也是自然水循环的一大优点。A.
正确
B.
错误
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举一反三
【单选题】We have to investigate as _________ customers as possible in order to make sure of the potential of the market.
A.
many
B.
much
C.
more
D.
most
【单选题】We consider ______ he should have left without telling anyone beforehand.
A.
strange why
B.
it strange what
C.
it strange that
D.
that strange
【单选题】According to the passage, what should a successful organization have?
A.
Large capital investments.
B.
The capability to change.
C.
Many employees.
D.
A large production capacity.
【简答题】如图，在正方体ABCD-A 1 B 1 C 1 D 1 中，求证：平面A 1 BD ∥平面CB 1 D 1 ．
【简答题】如图， 在正方体ABCD—A 1 B 1 C 1 D 1 中，E，F分别是正方形A 1 B 1 C 1 D 1 和ADD 1 A 1 的中心，则EF和BD所成的角是 。
【单选题】Ten minutes earlier, ______ we could not have been a aught in the heavy rain.
A.
if
B.
unless
C.
and
D.
so
【简答题】如图，在正方体ABCD-A 1 B 1 C 1 D 1 中，求证：平面A 1 BD∥平面CD 1 B 1 ．
【单选题】— Do you have _____ at home now, Stella? — No, we still have to get several pounds of fruit and some tea.
A.
something
B.
anything
C.
everything
D.
nothing
【单选题】如图：已知正方体ABCD－A1B1C1D1中，E为棱CC1的中点．如果一只蜜蜂在正方体ABC－A1B1C1D1内部任意飞，则它飞入三棱锥A1－BDE内部的概率为（ ）
A.
B.
C.
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