画线的词表“百姓”义的是：A．黔首共馀食，莫之知也 B．用之凡庶，其欺已甚 C．拯黎

地球的赤道周长约为    (    )

A．7万千米

B．6万千米

C．5万千米

D．4万千米

The scientists all agreed that rules of physics, ______ we are allfamiliar, govern the world.[ ]

A.to which

B.on which  

C.which

D.with which

Rt△ABC中，∠C=90°，∠B=2∠A，AB=6，则BC=______．

顶叶中央后回是

A．嗅觉中枢
B．视觉中枢
C．听觉中枢
D．皮层运动中枢
E．皮层感觉中枢

—Did your uncle tell you ________?

—Yes, he said he went there in 2008. [ ]

A. how he goes to Wuhan

B. why did he visit Kunming

C. when he traveled to Hong Kong

D. where did he spend his vacation