下列化合物适用于离子交换色谱法的是（）
A.萜类
B.生物碱
C.淀粉
D.甾体类
E.糖类
参考答案：B
There are 30 people________in the traffic accident but the injured ________ rescued at once.
A．injuring; were
B．injuring; was
C．injured; was
D．injured; were
这个标志是何含义？（）
A．避险车道
B．应急车道
C．路肩
D．急弯道
