单项选择题

Protecting the earth is a worldwide question because ______

A．pollution is everywhere in the world
B．polluted air and water in one place affects distant areas
C．people all over the world are responsible for the pollution problem
D．all of the above

<上一题目录下一题>

热门试题

单项选择题

A desert is probably ______.

A．grassy
B．wet
C．treeless
D．muddy

单项选择题

The students' problem the bank knows about is ______.

A．the need for a regular statement
B．the need for advice on money matters
C．a student has a lot to do
D．a student's income is not high enough