单项选择题

According to the passage, we can infer that underground pollutants ______.

A．can be carried by water flow.
B．may not reach the surface.
C．especially dangerous when they exist.
D．form spreading plumes of contaminants.
<上一题 目录 下一题>
热门 试题

单项选择题
In planning an exercise, you’d better think, the following factors except ______.
A．age
B．one's personal objectives
C．existing health condition
D．sex
单项选择题
Sixty percent of television viewer chose her as their ______ actress.
A．fortunate
B．preferred
C．favorite
D．preferable
相关试题