It's time ____ lunch. [ ]
A. for
B. to
C. for have
D. have
答案：A
I often go to Kitty's home ______ 4 o'clock ______ the afternoon ______ Sundays. [ ]
A. in; on; at
B. on; at; in
C. at; in; on
D. in; at; on
剧烈运动时，少尿的主要原因是（）
A.肾小球毛细血管血压增高
B.抗利尿激素分泌增多
C.肾小动脉收缩，肾血流量减少
D.醛固酮分泌增多
E.肾小球滤过膜面积减少
