一组数据3、-1、0、2、x 的极差是5，则x=（ ）。
-2或4
0.85×7.92的积里有4位小数。[ ]
— What is his suggestion?
— Just guess the meaning of it whenever you ________ a new word in reading. [ ]
A. come in
B. come at
C. come across
D. come about
