热原的主要成分是
A．蛋白质
B．胆固醇
C．脂多糖
D．磷脂
E．生物激素
参考答案：C
She attended some courses, including typing and book-keeping, because she was ______ to get a good job.
A．confident
B．skilful
C．fortunate
D．keen
HLM—S60型滑块卡瓦打捞矛为（）打捞矛。
A.双滑块
B.单滑块
C.三滑块
D.有水眼
