问题描述:
1.__________ refers to the transformation of marginal lands into near-desert conditions that CANNOT be used for agriculture.
A.Biological magnification
B.Desertification
C.Deforestation
D.Eutrophication
2.Which of the following is a nonrenewable energy source?
A.geothermal energy
B.biomass fuels
C.hydroelectric power
D.coal
3.Currently,solar power contributes __________ of the world's energy needs.
A.less than 1%
B.5%
C.10%
D.25%
4.Which of the following is an effect of urbanization?
A.reduced carbon emissions compared to rural areas
B.reduced biodiversity of animal populations
C.increased biodiversity of plant populations
D.fewer invasive and exotic plants
A.Biological magnification
B.Desertification
C.Deforestation
D.Eutrophication
2.Which of the following is a nonrenewable energy source?
A.geothermal energy
B.biomass fuels
C.hydroelectric power
D.coal
3.Currently,solar power contributes __________ of the world's energy needs.
A.less than 1%
B.5%
C.10%
D.25%
4.Which of the following is an effect of urbanization?
A.reduced carbon emissions compared to rural areas
B.reduced biodiversity of animal populations
C.increased biodiversity of plant populations
D.fewer invasive and exotic plants
问题解答:
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