电缆头专用烘干箱安全操作？

What do you usually ______ him? [ ]

A. talk

B. speak

C. call

D. say

作为价值尺度，货币解决了在（）和（）之间进行价值比价比较的难题。

鸳鸯蝴蝶派代表作品《玉梨魂》的作者是（）。

目前我国溶解气体共有（）种。

A.1

B.2

C.3

D.4

When 9 students took a zoology quiz with a possible score of 0 to 10 inclusive, their average (arithmetic mean) score was 7.5. If a tenth student takes the same quiz, what will be the least possible average score on the quiz for all 10 students

A. 6.5
B. 6.75
C. 7.0
D. 7.25
E. 7.5