下列药品中，属于腐蚀性药品的是（）
A.苯酚
B.冰醋酸
C.松节油
D.硝化纤维
E.高锰酸钾
参考答案：A, B
-Attention, please. The plane has to be __________ because of the heavy rain.
-Oh, bad luck! We have to wait now.[ ]
A. put on
B. put off
C. put up
D. put away
“书边”有（）种形式。
A.一种
B.两种
C.三种
D.四种
