（）的治理方法以湿法为主，常采用水吸收法净化此废气，净化率可达99.9%。
A．氮气
B．硫化氢
C．氟化物
D．氯、氯化氢
参考答案：B
Do you know the boy ________ is sitting next to Jim?
Yes. He is Jim’s friend. They are celebrating his ________ birthday.
A．who, ninth
B．that, nineth
C．/, nine
D．which, nine
资金的转移过程，包括付款、转账等过程，称为（）。
A．资金流
B．信息流
C．商流
D．取物流
