在计算机中，一个字节所包含二进制位的个数是（ ）。
A．2
B．4
C．8
D．16
参考答案：C
Hurry up! The train _____. You know it _____ at 8:30 a.m. [ ]
A. leaves; leaves
B. is leaving; is leaving
C. leaves; is leaving
D. is leaving; leaves
原子是由（）和（）两部分组成。
