将（）通入酚钠盐的水溶液中，可以使酚重新游离出来。
A.NH3
B.CO2
C.H2
D.CH4
参考答案：B
消防员隔热防护服的款式为分体式隔热服和连体式隔热服两种。
根据上下文，补全对话中所缺的单词，每空一词。
A: Can I help you?
B: Yes, please. Today is Mother's Day. I want to buy a present for my 1. . But I don't know what
to buy.
A: Maybe you can buy her some 2. .
B: Great! But what flowers should I buy?
A: I think carnations are better. They show happiness and love. They are for mothers.
B: How 3. are they?
A: Twenty yuan a bunch (束).
B: OK. I'll buy carnations. Here is the 4. .
A: Thank you and best 5. to your mother.
