(C)

You have heard a lot about ozone layer on TV and radio. The ozone layer has a hole in it. There are high ozone levels in the air. Do you know ozone is good or bad? The good ozone is found miles above the earth. That is an ozone layer. But the ozone layer is becoming thinner. It is being destroyed by chemicals from refrigerators, air conditioners and farms. As the ozone layer is destroyed, more harmful UV rays (紫外线) are reaching the Earth's surface. There are more cases of skin cancer among humans. Production of corn and other crops (农作物) is reducing. Plants in the oceans are being destroyed. Food supplies could be reduced.

There is good news, however. The ozone layer is thinning at a slower speed. Many of the chemicals that destroy ozone have been stopped. Scientists believe that someday the hole in the ozone layer will be repaired (修理).

The bad ozone is found near the ground. It is a form of air pollution. High levels of bad ozone can cause healthy problems. Anyone, even healthy people, spends a lot of time outside in summer, and they can be affected. Bad ozone comes from cars and factories.

As with other forms of air pollution, steps can be taken to reduce ozone. Save energy in your home by turning off electric equipment. Reduce ozone from cars by carpooling (拼车), bicycling, or taking public transportation.

阅读短文，并根据短文内容回答所提问题。

1. How many kinds of ozone are there?

2. What do UV rays cause people on the earth?

3. Why is the ozone layer thinning at a slower speed now?

4. Where can people find bad ozone?

5. How can we reduce the bad ozone in our life?

Ⅵ. 综合填空

阅读短文，从方框中选择适当的词并用其正确形式填空，使短文通顺、意思完整。每空限填一词，每词限用一次。方框中有两个词是多余的。

about, dream, call, work, although, and, run, offer, work, encourage, one, speech

Pete McBride was born in California, but moved to Colorado when he was a week old. His 1 ____ was to be a professional athlete when he was a child. After college his writing started when he worked as an intern (实习生) at an environmental magazine 2 ____ High Country News. One exciting and pleasant flight journey (旅行) became his 3 ____ story for National Geographic. Last year he followed the Ganges River, from source to sea, for National Geographic. The experience 4 ____ him to dedicate (致力) his life to freshwater.

5 ____ freshwater supplies continue to become more challenged (受到挑战的) throughout the world, few realize where their water comes from (not the tap). So he thinks educating people 6 ____ the watersheds (流域), the rivers that connect (连接) them, and how this vital resource can be used more properly inspires (激励) him to keep 7 ____ after water and rivers around the world. He also would love to 8 ____ people simple ideas to save water in their lives.

Nowadays he travels a lot not only for work but also giving 9 ____ at colleges to let people know more about freshwater. But there is also a lot of time_10_on computers-editing photos and films. He thinks his work is meaningful.