《炼铁安全规程》规定：（）属于一类煤气作业。
A.风口平台
B.热风炉周围
C.焊封炉皮
D.铸铁机
参考答案：A, B, C
—Did Liu Xiang’s training programme _____ a lot of his time?
—Yes, that’s right.
A．set up
B．take up
C．grow up
D．look up
