下列不是药物通过生物膜转运机制的是（ ） A．主动转运 B．促进扩散 C．渗透作用

一The summer vacation is coming．Do you have any ideas about the coming vacation?

－I 　　volunteering in the old people’s home．What do you think of it?

A．suggest

B．expect

C．wish

D．would like

_____ and short of breath, Andy and Kate were the last to arrive at the top of the high rise. [ ]

A. Being tired

B. Tired

C. Tiring

D. To be tired

如图所示，两卫星A、B在各自的轨道上绕地球做匀速圆周运动，半径之比R_A：R_B=a：b，则（　　）

A．两卫星A、B的线速度大小之比为

B．两卫星A、B的线速度大小之比为

C．两卫星A、B的角速度大小之比为^

D．两卫星A、B的加速度大小之比为a²：b²

直线上一点(1，-2，1)处法平面与直线夹角为()。

A.A

B.B

C.C

D.D

身热不扬，是指

A．发热不高，热象模糊
B．身热，热象明显
C．发热以下午为甚
D．发热以夜间为甚
E．身热稽留而热象不显