鲸蜡是由（）头部提取出来的油腻物冷却和压榨而得到的固体蜡。
A、深海鲸
B、鲨鲸
C、抹香鲸
D、象鼻鲸
参考答案：C
A new survey shows that 54 percent of Americans do not take prescription medicines ________
though they are important to their health. [ ]
A. as they instruct
B. as were instructed
C. as to be instructed
D. as instructed
遇暴风、雨、雪天气时怎样行车？
