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【简答题】
已知抛物线C 1 ：y=x 2 ，椭圆C 2 ：x 2 + y 2 4 =1． （1）设l 1 ，l 2 是C 1 的任意两条互相垂直的切线，并设l 1 ∩l 2 =M，证明：点M的纵坐标为定值； （2）在C 1 上是否存在点P，使得C 1 在点P处切线与C 2 相交于两点A、B，且AB的中垂线恰为C 1 的切线？若存在，求出点P的坐标；若不存在，说明理由．
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举一反三
【单选题】At the conference, people of different _______ were given a chance to exchange theirs with each other.
A.
points
B.
manners
C.
views
D.
ways
【判断题】工作轮换这种培训方式主要是各部门的受训员工轮换到几个不同的工作部门学习知识和技能。可以丰富员工的工作内容,获得不同领域的工作经验;有助于员工从多角度思考和理解问题,了解其他职位的工作内容和工作方式,同时培养员工工作的整体观和全局观。
A.
正确
B.
错误
【单选题】听力原文：(A) They are looking through the microscopes. (B) They are sitting next to each other. (C) The couple is watching dolphins. (D) They are sitting on the table.
A.
B.
C.
【简答题】A．People might lose respect for each other. B．People might have less trust in each other. C．The operation of the team will not be improved. D．There would be more differences between each other.
【单选题】Everymeans ___ tried but without any result.
A.
have been
B.
is to be
C.
are tobe
D.
has been
【单选题】The two old sisters，_______ so long，held each other and burst into tears.
A.
being separated
B.
having been separated
C.
having separated
D.
had been separated
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