有机形式毒性比无机形式的毒性强的重金属是______。
A．砷
B．汞
C．镉
D．铅
参考答案：B,C,D
Please give ____________ a cup of water. ____________ cup isn't here.[ ]
A. I, My
B. mine, I
C. me, My
D. me, Mine
Jason and I enjoy ________ music very much. [ ]
A. hear
B. listen to
C. hearing
D. listening to
