单项选择题

The speaker advises us to use the Earth's resources wisely because ______.

A．the Earth is heavily polluted
B．nature cannot recycle its resources
C．there are more and more people on the Earth
D．no more new resources can be added

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热门试题

单项选择题

What can we infer from the passage

A．Nature has changed our environment.
B．We have wasted resources and polluted our environment.
C．Our resources are nearly used up.
D．We have cooperated with nature well.

单项选择题

The Earth is in trouble because of all the following EXCEPT ______.

A．dirty roadside
B．sick plants and animals
C．unhealthy water
D．poisonous air