高瓦斯矿井、有煤（岩）瓦斯（二氧化碳）突出危险的矿井的每一个采区和开采容易自然煤层的采区，必须设置至少1条（）。
参考答案：专用回风巷
改错（10分）
小题1:Her mother oftentells her doesn’tplay in the street.
A B C D
小题2:To shesurprise, this phone call changedher life.
小题3:“Where is he ?” “He has been to Paris.”
小题4:Learn a foreign languageis very important for us.
小题5:The boy is not enough oldto be a volunteer. __
仙人掌的叶退化成针状，这使它更适合在什么地方生存（ ）
A．阴湿草原
B．寒冷荒漠
C．干燥沙漠
D．温暖森林
