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【简答题】
如图，已知抛物线 的焦点为 ，过焦点 且不平行于 轴的动直线 交抛物线于 ， 两点，抛物线在 、 两点处的切线交 . （Ⅰ）求证： ， ， 三点的横坐标成等差数列； （Ⅱ）设直线 交该抛物线于 ， 两点，求四边形 面积的最小值．
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举一反三
【单选题】—When were you born? —I was born _____________. [ ]
A.
in June three, 1989
B.
on June the third, 1989
C.
in June third, 1989
D.
on June the three, 1989
【单选题】It is implied that __________ 查看材料
A.
powerful earthquakes usually occur after minor ones
B.
modem facilities add to the danger of an earthquake
C.
passing trucks are as dangerous as minor earthquakes
D.
there is a powerful earthquake occurring every two years
【单选题】The function of the computer mentioned in the passage is to____,
A.
counterbalance an earthquake's action on the building
B.
predict the coming of an earthquake with accuracy
C.
help strengthen the foundation of the building
D.
measure the impact of an earthquake's vibrations
【单选题】—When were you born? —I was born _______. [ ]
A.
in June three,1989
B.
on June third,1989
C.
in June the third,1989
D.
on June the three,1989
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