8. 由题干关键词fossil fuels定位至倒数第三段第三句Two effective techniques for limiting CO2 emissions would be, (1) to replace fossil fuels with energy sources that do not emit CO2, and (2) to use fossil fuels more efficiently.由此可见,题干是对这句话的同义转述,据此,答案应为CO2 emissions.
9. 由题干关键词alternative fuels和more environmentally friendly定位至倒数第二段最后一句Until research comes up with less expensive alternative fuels, fossil fuels will continue to be used as the worlds primary energy source. 据此,答案应为less expensive.
10. 由题干关键词protect the marine creatures定位至最后一段最后一句It is important to protect existing marine habitats, not only to protect a major resource of everything from food to tourism to coastal protection. 无疑,protect后面就是答案,但是应该根据题干的含义进行简化。经分析可知,与海洋生物自身的生存相对比,它们作为食品、旅游和海岸保护资源都是从人类角度出发的,据此,可以把这些作用总结为resource to human being.
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