加油站管沟要求填满砂子原因是（）.
A.防止管沟积水
B.防止积聚油蒸汽
C.防止影响交通
D.保护管路
参考答案：B
I’ve had enough of my neighbor. I’m going to ______ their noisy parties right now.
A．put an end to
B．give way to
C．look up to
D．come up to
正常人血浆pH为（）
A.6.32～6.45
B.6.50～7.05
C.7.10～7.30
D.7.35～7.45
E.7.50～7.65
