黄金阅读MINERALS AND PLANTS第十一题，又觉得是两个答案。

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Paragraph 6: Only recently have investigators considered using these plants to clean up soil and waste sites that have been contaminated by toxic levels of heavy metals – an environmentally friendly approach known as phytoremediation. This scenario begins with the planting of hyper accumulating species in the target area, such as an abandoned mine or an irrigation pond contaminated by runoff. Toxic minerals would first be absorbed by roots but later relocated to the stem and leaves. A harvest of the shoots would remove the toxic compounds off site to be burned or composted to recover the metal for industrial uses. After several years of cultivation and harvest, the site would be restored at a cost much lower than the price of excavation and reburial, the standard practice for remediation of contaminated soils. For examples, in field trials, the plant alpine pennycress removed zinc and cadmium from soils near a zinc smelter, and Indian mustard, native to Pakistan and India, has been effective in reducing levels of selenium salts by 50 percent in contaminated soils.
11. It can be inferred from Paragraph6 that compared with standard practices for remediation of contaminated soils, phytoremediation
¡does not allow for the use of the removed minerals for industrial purposes.
¡can be faster to implement
¡is equally friendly to the environment
¡is less suitable for soils that need to be used within a short period of time.
此题虽然做题时做对了，选的是D，可是回过头开发现C好像也是对的啊。求解这个问题谢谢啦。
还有一个句子
The first step in phytoremediation is the planting of hyper accumulating plants in the area to be cleaned up.
这个句子是一个同义句的转换，答案就是这个。也是做对了这题但是觉得还有问题。这个问题就在于the area to be cleaned up.这个句子应该翻译为需要清理干净的土地，还是说已经清理干净的土地呢？如果不是做同义，我可能会翻译为已经清理干净的土地。希望大家帮忙解答一样这个问题吧。谢谢

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C选项是is equally friendly to the environment
这个选项的错误在于这个单词 equally。。。 phytoremediation比standard practices for remediation要friendly。 去掉这个equally就对了。
故答案选D

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2# dkflame
去掉equally是对的 可是……好像没有体现它们的比较关系

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2# dkflame  
去掉equally是对的 可是……好像没有体现它们的比较关系
shamrock_hk 发表于 2011-1-9 17:44

Only recently have investigators considered using these plants to clean up soil and waste sites that have been contaminated by toxic levels of heavy metals – an environmentally friendly approach known as phytoremediation.
这句话的前半句就是指以前那个方案不干净。。。

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4# dkflame
我觉得吧……是因为contaminated by toxic levels of heavy metals ，所以那个soil不干净 还没有经过修复或者植物积累之类的措施

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4# dkflame  
我觉得吧……是因为contaminated by toxic levels of heavy metals ，所以那个soil不干净 还没有经过修复或者植物积累之类的措施
shamrock_hk 发表于 2011-1-9 17:54

对呀。。。这就是以前那种处理手段带来的不干净啊。。。