A, I don't know. But maybe they use a machine.
B. Yes. And I also take photos with my mobile.
C. No. But there was a nice river outside the city.
D. Usually. I rarely use pens and paper now.
E. Oh, no. She used hands to wash clothes in the past.
一年中去南极洲考察最好的时间为( )
我们每天都要排出一定量的尿液,以保证体内环境的稳定,下列关于尿液形成和排出过程的描述,错误的是( )