肾脏中对原尿具有重吸收作用的结构是[ ]
A．肾单位
B．肾小球
C．肾小管
D．肾小囊
答案：C
国人咯血的常见原因是
A．肺结核
B．肺吸虫
C．肺梗死
D．肺淤血
E．肺癌
. ________ in one leg, he never had a chance to get a job.
A．Weak and lame
B．He was weak and lame
C．Though weak and lame
D．Weak and lame as he was
