你可能感兴趣的试题

单项选择题

Why does a professor of science recommend watching science fiction films?
A、Because watching films is quicker than reading books.
B、Because science fiction films are more accurate than textbooks.
C、Because students can only learn if they are relaxed.
D、Because the mistakes in them can help students.

问答题

铁路运输危险货物按期主要危险性和运输要求划分为：爆炸品、气体，（    ）、遇水放出易燃气体的物质，氧化性物质和有机过氧化物，毒性物质和感染性物质，（    ）（  ），杂项危险物质和物品九类。