道路交通事故中,在来车方向距事故现场( )m处竖立警告标志,防止其他车辆进入事故现场。
A.100 B.150C.200 D.250
参考答案:A
--Could you tell us __________ ?
--About two weeks.
A.how often are we going to be away
B.how often we are going to be away
C.how long are we going to be away
D.how long we are going to be away
谷类食物与下列哪种食物混合食用,可提高其蛋白质生物价值()
A.鸡蛋
B.牛奶
C.鱼、虾
D.大豆
E.猪肉