多用途滤毒罐在氧气含量不低于37%的情况下使用。（）
参考答案：错
用所给词的适当形式填空。
1. The teacher told us not to go ( swim) alone in the river.
2. The Women's World Cup _ (not begin) until 1991 when China hosted it in Guangzhou.
3. Jackie Chan is a famous) _ (act)．
Doctors are doing research to find out what happens physically when people ________ smoking.[ ]
A. quit
B. decline
C. depart
D. reserve
