用30号石油沥青配制快挥发性冷底子油应加（）。
A.柴油70kg
B.汽油70kg
C.柴油60kg
D.汽油60kg
参考答案：B
单项选择。
______ you like summer? [ ]
A．Would
B．Do
C．Are
I think this talk is worth _______. [ ]
A. to listen
B. to listen to
C. listening
D. listening to
