使用混凝、澄清等方法，可以降低水中的浊度，但对去除细菌作用不大。
参考答案：错
年轻肺气肿者，可能为哪项血清蛋白质缺陷（）
A.ALB
B.AAG
C.Hp
D.AMG
E.AAT
用所给单词的适当形式填空。
1. It’s important for children to learn about road ______(safe).
2. To prepare for the match, they receive two hours’ ______ (train) every day.
3. The ______ (France) are famous for their cooking.
4. Such after-school activities as sports clubs and language ______ (society) are usually popular.
5. He was late, but ______ (fortunate) the meeting hadn’t started.
