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【单选题】
截平面与圆锥轴线的相对位置是哪一种情况时,截交线是双曲线A.
垂直于轴线
B.
平行于轴线
C.
过锥顶
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反馈参考答案：
举一反三
【简答题】现代旅游是指第二次结束后,特别是本世纪( )以来,迅速普及于世界各地的社会化旅游活动
【单选题】----- Our holiday cost a lot of money. ----- Did it? Well, that doesn’t matter ________ you enjoyed yourselves.
A.
unless
B.
as soon as
C.
as long as
D.
though
【单选题】You don't look _______. What's the _______ you? [ ]
A.
good, wrong to
B.
well, matter with
C.
fine, happened to
D.
healthy, up with
【单选题】．—What’s the matter with the man hanging his head there? —Well, if you _______ know, he was caught stealing my bike.
A.
must
B.
may
C.
can
D.
shall
【单选题】No matter _____ you do, you must do it as well as possible. [ ]
A.
what
B.
how
C.
when
D.
where
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