According to the report, the rise of the earth's average surface temperature is attributed to some natural reasons.
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The most concentrated deforestation occurs in tropical rainforests.
A. 对
B. 错
El Nino phenomenon doesn't occur in a perfectly regular pattern. It seems to happen every 2 to 7 years.
A. 对
B. 错
The ultraviolet radiation from the sun can produce long-term effects on human beings and animals, but not on plants.
A. 对
B. 错
Speechescanbearrangedinproblem-solutionorder.
A. 对
B. 错