— Can you guess _______ the new Nike sports shoes?

—Yes, maybe he asked his grandpa for the money, I think.

A．how he paid for

B．where he bought

C．when he paid for

D．why he bought

循环烷烃换热器安全阀排放到（）。

A.大气

B.火炬

C.提馏塔底泵入口

D.脱氢进料平衡罐