边际消费倾向递减可起经济自动稳定器作用。（）

婴儿每日用于排泄损失能量占总需能量的百分比是（）。

A．所需能量约占总需要能量的5%～6%

B．所需能量约占总需要能量的7%～8%

C．所需能量约占总需要能量的10%

D．所需能量约占总需要能量的25%～30%

E．所需能量约占总需要能量的50%～60%

下列各句中有语病的一句是 [     ]

A、胡 * * 近日对屯兰煤矿瓦斯爆炸事故作出重要批示，要求各有关部门采取紧急措施，设法抢救被困人员。

B、国庆60年盛典引来海外网民的广泛关注，他们在国外多家网站上留言，对庆典的成功举办表示由衷敬佩。

C、新中国成立后特别是改革开放以来，中国人民依靠自己的智慧和力量，取得了重大的一批自主创新成果。

D、中国财政部日前表示，中国将进一步增强汇率形成机制的灵活性，并愿与东盟及日韩共同促进亚洲繁荣。

动词填空。

1. You won't pass the exam if you __________ (not be) careful.

2. The children are all looking forward to ___________ (begin) the party at once.

3. Is it important for us ___________ (not take) the goldfish out of the water?

4. The boy just __________ (weigh) about 2000 grams when he was born.

5. Could you tell me who ___________ (speak) at tomorrow's meeting?

6. The twin with her friends __________ (prepare) for the trip to Yunnan at present.

7. The policeman __________ (catch) the thief and sent him to the police station.

8. Many shops in Australia __________ (not open) on Sundays.

9. Don't hurry up. His best friend often makes him __________ (wait) for a long time.

怎样指导班上保育员进行空间消毒？