具有清热化痰、软坚散结作用的辅料是
A．河砂
B．白矾
C．豆腐
D．土
E．蛤粉
参考答案：E
If he had helped you, he would have risked ________his job.
A．to lose
B．losing
C．to be lost
D．being lost
给试管里的物质加热，试管夹夹在试管的（）
A.盛有受热物质的部位
B.中间部位
C.试管口处
D.近试管口长度1/4左右处
