题目内容
Human beings are always aware of the tough situation between man and nature.
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According to the report, the rise of the earth's average surface temperature is attributed to some natural reasons.
The most concentrated deforestation occurs in tropical rainforests.
El Nino phenomenon doesn't occur in a perfectly regular pattern. It seems to happen every 2 to 7 years.
The ultraviolet radiation from the sun can produce long-term effects on human beings and animals, but not on plants.
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