消防员避火防护服适用于（）作业时穿着。
A.进入火焰区域短时间灭火或关阀
B.处置危险化学品
C.处置放射性物质
D.处置生物毒剂
参考答案：A
Is it in the factory _____ you visited last week _____ this kind of car is made? [ ]
A. that; that
B. which; where
C. where; which
D. which; which
变质岩包括下列（）岩石。（）
A.粗面岩
B.片麻岩
C.千枚岩
D.硅岩
