1.__________ refers to the transformation of marginal lands

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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

我的答案是ACBA,请参考

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