We will hear what he must say and observe what he will do for what he says and what he does often _______.
A：don't agree
B：isn't consistent
C：aren't consisted
D：doesn't agree
某社团有男生30名，女生20名，从中抽取一个容量为5的样本，恰好抽到2名男生和3名女生，则
①该抽样一定不是系统抽样；
②该抽样可能是随机抽样；
③该抽样不可能是分层抽样；
④男生被抽到的概率大于女生被抽到的概率；
其中说法正确的为（ ）
下列四辐示意图，能够正确表示地球自转方向的是（ ）
You had better ____ (not eat) so much fried chicken. ____ (eat) too much ____(make) you unhealthy.
一个角的余角比这个角的补角的一半小40°，则这个角为____ 度．
