当血液由心室泵入动脉时，心脏的心房和心室的舒缩状况是（　　）

有学者评论某次改革时说：“天冷，本想弄点木材烤烤手，想不到竟将整个房子烧了。”据此判断，他评说的是（　　）

填空

①What is your father? ____                            a. No, it's very boring.

②Do you like playing basketball?____              b. We can play basketball.

③What did you do yesterday afternoon?____     c. It's rainy.

④What's the weather like today?____               d. My father is a doctor.

⑤What can you do after school?____                e. I shopped at a shopping mall.

下列各组混合物中，能用分液漏斗进行分离的是（　　）

第三次科技革命改变了世界面貌，给人类的日常生活带来巨大变化。此次科技革命中（  ）