测试题
1.High concentrations of harmful gases are resulted from______________.
A) ozone depletion B) global warming
C) the consumption of fossil fuels D) serious water and air pollution
2.The sun and wind are called renewable energy because they are____________.
A) natural B) inexhaustible
C) newly-found D) clean
3.Biomass,though a renewable energy,mainly causes_______________.
A) indoor pollution B) outdoor pollution
C) industrial pollution D) agricultural pollution
4.In the l970s,some countries began to be concerned about solar energy because of___________.
A) economic recession B) sharp rise in oil prices
C) reduced oil production D) increased research funds
5.In the hills of the Himalayas, chakki are used for_____________.
A) purifying water B) keeping animals
C) producing power D) exchanging goods
6.What is recommended to be used by the remote rural areas with little access to conventional energy sources?
A) Small hydropower plants. B) Solar energy heaters.
C) Wind power mills. D) Hot spring thermal energy.
7.It is mentioned that,between the surface and the depth of the ocean,there are great differences in_____________.
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