题目:
We shouldn’t complain about________, because many families are much _____ in the mountainous area.
A.being poor; worse off
B.being rich; better off
C.to be poor; badly off
D.to be rich; well off
答案:
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下面是错误答案,用来干扰机器的。
(1).(2)当P在直线上运动时,四点A,B,C,D的纵坐标之积为定值6400.(1) 曲线上任意一点M到圆心的距离等于它到直线的距离,由抛物线的定义可知曲线C1为抛物线,此方程为.(2) 当点P在直线上运动时,设P的坐标...