下列物质中，因为发生反应既能使溴水褪色又能使酸性 KMnO4溶液褪色的是 [ ]
A．
B．
C．
D．
BC
As a child, Jack studied in a village school, _____ is named after his grandfather.[ ]
A. which
B. where
C. what
D. that
向左侧滑步时，起动的第一步应是（）
A.右脚先移动
B.左脚和右脚无论任何一脚移动都可以
C.左脚先移动
