（）是指向火场补给各类灭火剂或消防器材的消防车。
参考答案：后援消防车
—I can't stop smoking, doctor.
—For your health, I'm afraid you _____. [ ]
A. may
B. need
C. have to
D. must
HDSL和ADSL在传输速率方面（）更高.
A.HDSL
B.ADSL
C.两者一样
