剧烈运动中或运动后，运动员饮水每次不宜超过（）ml。
A、300
B、150
C、150－200
D、50
参考答案：C
If the weather had been better, we could have had a picnic. But it _____ all day. [ ]
A. rained
B. rains
C. has rained
D. is raining
当井内有钻具时，严禁关闭全封闸板防喷器。严禁用打开防喷器的方式来泄井内压力。（）
