随机误差是（）向性的，它符合（）规律，可以用（）方法来减小。
参考答案：非单；正态分布；多次测量取其平均值
大黄使用方法是：欲泻火通便应使用 ① 大黄，入汤剂应 ② 。
I don't want to talk to Kate now. She is almost_______me these days. [ ]
A. interested in
B. mad at
C. worried about
D. waiting for
