如图是某款电热水龙头的电路原理图，R₁、R₂为电热丝，通过旋转手柄可实现冷水、温水、热水档之间的切换，若R₂=2R₁，水龙头在温水档正常工作时电功率为2000W，则它在热水档正常工作时的功率为（　　）

⑴I'm hungry.____                       A. She's running.

⑵What are you doing?____       B. He's making noodles.

⑶What are they doing?____      C. I'm hungry, too.

⑷What is she doing?____          D. They are rowing a boat.

⑸What is Sam doing?____         E. I'm reading a book.

在有氧呼吸的全过程中，CO₂的形成发生在(   )

—Peter is not himself these days.                     
—Well, could you tell me________?

读“我国地形分布图”，完成要求：