题目内容
对 PNP 型晶体管来说，当其工作于放大状态时，（ ）极的电位最低。
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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.
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.
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