衡量生活设施完善度应从()方面进行。
A.设施类型是否齐备
B.设施质量
C.设施水平
D.使用的保证率
参考答案:A, C, D
下列以水力发电为主的省级行政区是 [ ]
A.山西
B.黑龙江
C.湖北
D.山东
It's four o'clock in the afternoon. The boys _______ in the pool.[ ]
A. is swiming
B. are swimming
C. are swiming