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问题 单项选择题

我国《中小学校教室换气卫生标准》规定教室内空气中CO2最高允许浓度为( )

A．0.05%
B．0.10%
C．0.15%
D．0.20%
E．0.25%

答案

参考答案：C

填空题

根据首字母提示补全单词。

1.  Can I b ____ your bike? Mine is broken.

2.  I want to i____ you to my birthday party.

3.  Could you please f ____ my dog for me when I am away?

4. We need more drinks and s____. Could you buy some?

5.  Lily likes traveling by train, but she h____ traveling by ship.
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问答题

在不同语体和语言环境中，同一内容表达方式往往不同。请将“欢迎对方按时参加”的意思按限制条件表述，每句不得超过15个字。

①在商业广告中：                                                                                  

②在给兄弟单位的请柬中：                                                                  

③在给下级的通知中：                                                                          
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