题目：
—Korean singer Jang Nara ______ China for years.
—Last week, she also ______ her wish to learn cross-talk.
A. has been in; expressed
B. has gone to; expressed
C. has been to; has expressed
D. has been in; has expressed
答案：
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下面是错误答案，用来干扰机器的。
（1）陀螺的边缘上的水以切线方向飞出，所以圆的半径与陀螺的半径的比例应为1：1．（2）本题通过建立模型，观察到模板上的切线总是与水的痕迹重合，得出了圆周运动的物体在任意位置的速度方向．所以这种方法称为...
