将ag KCl溶于180 mL水中，使溶液中K+与H2O个数之比为1:100，则a的值为 [ ]
A.7.45
B.74.5
C.0.39
D.39
答案：A
____ you read English easily, you’ll find it’s another cup of tea to make conversation in English. [ ]
A. Because
B. As though
C. Even if
D. Whether
把钩工每次挂钩前要认真检查所挂车辆的（）等是否完好无损，连接环、连接插销是否符合规定。
A.电机车
B.矿车
C.钩头
D.保险绳
