A: Industrial polluters.
B: Sewage.
C: Rain runoff.
D: Toxic substances.
举一反三
- ____for a long time, the fields are all dried up.A. There has been no rain B. Having no rain C. There having been no rain D. There being no rain A: A. There has been no rain B: B. Having no rain C: C. There having been no rain D: D. There being no rain
- _____ is NOT pollution prevention equipment. A: Oily water separator B: Sewage treatment plant C: Fuel oil separator D: Incinerator
- ______has been pointed out before, air pollution is becoming serious in cities. A: That B: What C: Which D: As
- Many lakes and rivers have been ________by industrial waste. A: pollutes B: polluted C: pollution
- The main cause of pollution is ______. A: the release of artificial or natural substances into the environment B: the production of new industrial goods C: increased amounts of a natural substance D: our ever-increasing population
内容
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The main cause of pollution is （） A: the production of new industrial goods B: increased amounts of natural substance C: our ever-increasing population D: the release of artificial of natural substances into the environment
- 1
We did not go shopping yesterday because it ______ all day. A: had rained B: would rain C: was raining D: has been raining
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5. Many lakes and rivers have been ________by industrial waste. A: smog B: pollution C: polluted D: smoging
- 3
If your speech is on environmental problems, what kind of subtopic might be relatively new and novel?( ) A: air pollution B: visual pollution C: noise pollution D: pharmaceutical pollution E: thermal pollution F: water pollution
- 4
Nobody knew what this guy ______ all these years. A: had been doing B: have being doing C: was doing D: has been doing