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【简答题】
求双曲线 y 2 16 - x 2 9 =1 的实轴和虚轴的长、顶点和焦点的坐标、离心率．
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举一反三
【单选题】He has a daughter____ works in a hospital
A.
Who/which
B.
who / that
C.
which /that
D.
whose/whom
【单选题】—There _______ little fresh water _______. —Don't worry. We'll soon walk out of the desert. [ ]
A.
has; drinking
B.
are; to drink
C.
is; to drink
【单选题】— Go and ask the waiter how much _____. — Don't worry. It has been _____. [ ]
A.
does the meal cost, paid for
B.
the meal costs, paid
C.
the meal spends, paid
D.
the meal costs, paid for
【单选题】He has a daughter____ works in a hospital
A.
who/that
B.
which/that
C.
which/who
D.
whose/whom
【单选题】A short __________ of natural gas has caused a lot of economic experts to worry. [ ]
A.
supply
B.
use
C.
product
D.
information
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