国家公务员的工资实行（）工资制。
A.级别
B.职务
C.基础
D.职级
参考答案：D
由于地形的影响，亚洲河流的流向是（ ）
A．自西向东
B．自东向西
C．南北走向
D．呈放射状
He doesn't read the English text very often. ______ he has failed again. [ ]
A. It is why
B. That's because
C. It is reason
D. That's why
