① Let's go home! ____ A. It's 9 o'clock.
② Where is Amy? ____ B. Yes.I do.
③ What time is it now? ____ C. OK.
④ Do you like music class? ____ D. She is in the art room.
读四大洲轮廓图,完成下列各题。
西伯利亚不利于农业发展的主要原因是( )