D.how coffee production used to be.
33.What does increased production of full-sun coffee bring about?
A.More insects.
B.Better quality coffee.
C.Larger farms.
D.Higher profits.
34.How do farmers find more land for growing full-sun coffee?
A.They buy more land from other farmers.
B.They cut down trees.
C.They move to another country.
D.They turn grassland into farmland.
35.The full-sun method may affect the following EXCEPT_____.
A.insects
B.air
C.brids
D.humans
Soot(煤烟灰)and Snow:a Hot Combination
New reasearch from NASA scientists suggests emissions of black soot after the way sunlight reflects off snow.According to a computer simulation,black soot may be responsible for 25 percent of observed global warming over the past century.
Soot in the higher latitudes(维度)of the Earth,where ice is more common,absorbs more of the suns energy and warmth than an icy,white background.Dark-colored black carbon,or soot,absorbs sunlight,while lighter colored ice reflects sunlight.
Soot in areas with snow and ice may play an important role in climate change.Also,if snow and ice covered areas begin melting,the warming effect increase,as the soot becomes more concentrated on the snow surface.This provides a positive feedback,as glaciers and ice sheets melt,they tend to get even dirtier. said Dr.James Hansen,a researcher at NASAs Goddard Institute for Space Studies,New York.
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