以下属于绿色建筑中节约资源的是（） A.节能 B.节地 C.节水 D.节材 E.节人

农田生态系统中的生物因素有______，非生物因素有______．

—Mum, I've finished my work.

—Good, and ________ you choose to play on your PSP or listen to music on your iPod, you mustn't disturb me.

A．whichever　

B．whether

C．whatever　

D．no matter

Henry speaks Chinese very well. He          in China since 2002.     [ ]

A. stays                        

B. stayed    

C. is staying                    

D. has stayed

电压互感器工作时，高压绕组与被测电路（），低压绕组与测量仪表或断电器的电压线圈并联。