—How do you study _____ a test?

—I study _____ working with a group.

A. for, for

B. to, by

C. for, by

D. by, for

YJ29滤嘴接装机水松纸储纸箱主要由（）、压轮、有机玻璃护门、支撑杆、导辊等组成。

A.供纸辊

B.拉纸辊

C.压纸辊

D.加速辊