题目内容

Complete each short paragraph (1-6) with a word or words from the list below.•average•environment•lack•level•liquid•plants•release•trapped1. Millions of years ago, the amount of oxygen in the air was much higher than it is now. This is one reason why some of the __________ and insects alive at that time were bigger than they are now.

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2. Some areas of the south have not had any rain for several months. The __________ of water has already killed crops, trees, and other plants.

3. Many people have been told that they should drink eight glasses of water each day on . However, plain water isn't the only you can drink; tea, coffee, and other non-sugary drinks are also OK.

4. People who work for oil companies are searching for new sources of oil. Oil is usually ___________ deep under layers of rock.

5. The politician lost his position in the government because of his lack of concern for the ___________. Many people disagreed with his views about developing the country's natural areas.