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【单选题】
曲面立体的截交线如右图所示,圆柱被截后,截交线形状是( )A.
直线
B.
圆
C.
椭圆
D.
双曲线
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举一反三
【单选题】In the sentence "Not every winter is critical for deer of course", the word" means_______
A.
finding fault
B.
forming a crisis
C.
urgently needed
D.
important
【单选题】In the sentence "God would not suffer Mr. Cotton err", the word "suffer" probably means .
A.
force
B.
let or allow
C.
see
D.
hear
【单选题】What's the meaning of "up in the air" in the sentence"Parents aren't sure about how to direct their children, because too much is up in the air."
A.
too difficult
B.
not real
C.
uncertain
D.
too much
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