8．
阅读短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。
The
Earth is about 4, 600 million years old Man lives on the Earth for only 35, 000
years. But we change our Earth in many ways. Many things we do are good, but
some are not good for the Earth.
Water
pollution
A lot
of people, birds and fish die each day because of water pollution. Factories
pollute the water. As a result (因此), the water in many rivers and lakes is now very
dirty.
Air
pollution
In
big cities, factories, cars and buses are the main causes of air pollution.
Many people in cities now have health problems. For example, Mexico City used
to be a beautiful sunny capital, but today there are many clouds in the sky.
And many people get ill because of the polluted air.
Soil
(土壤) pollution
In
order to have a better harvest (收获), some of the farmers use chemicals too much in
their fields. That's bad for the soil.
Hope
for the future
These
problems are very serious for our future, so all of us should do something to
protect the environment. If we can stop pollution, our Earth will become more
and more beautiful.
