肾癌三主征是指（）
A.血尿
B.发热
C.贫血
D.腰痛
E.肿块
F.体重下降
参考答案：A, D, E
肺的生理功能是（）。
A.主气
B.调气
C.行气
D.载气
E.纳气
Look out! Don't get too close to the house ____ roof is under repair. [ ]
A. whose
B. which
C. of which
D. that
