TPO 阅读 minerals and plants 问题求助

AnyaAnyaUID: 2695394

P6: 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 hyperaccumulating 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.

It can be inferred from P6 that compared with standard practices for remediation of contaminated soils, phytoremediation
A.does not allow for the use of the removed minerals for industrial purposes.
B.can be faster to implement
C.is equally friendly to the environment
D.is less suitable for soils that need to be used within a short period of time.

为什么答案是D，如果是D，文中应该提到phytoremediation的时间比standard practices for remediation of contaminated soils的时间要长，可是我没有从文中找到，文章只讲了several years of cultivation and harvest, the site would be restored at a cost much lower than the price of excavation and reburial。难道默认了standard practices for remediation of contaminated soils不用several years？这个没有逻辑呀~

求大侠帮助！

rebelpigUID: 2356028

注意那个词 叫做infer！！
就是你要读到他的潜台词  表面上没说 但是他有强调那个意思 而且答案里面就是说phytoremediation 不能用于short time，没有提到standard方法的事情
做这种题就是要按着他想让你想的方向去想  不要自己胡思乱想 多做tpo就可以反复琢磨他的出题意图 其实做题不是主要的 了解考试 nasty 的意图才是更高意图

风雪笑平生UID: 2787831

其他几个明显都错，D不好说，选D

zuyunqiUID: 2864834

注意这句
After several years of cultivation and harvest, the site would be restored at a cost much lower than the price of excavation and reburial,

说明通过这种方法，要经过好几年的栽种，才能以一个较深挖和多次填埋来说特别低廉的方式令土地得到修复。
这就暗示了D所说的“该办法不太适合短时间内就要使用的土地”，因为要花较长时间嘛。

史殿金UID: 3319267

A=说phytoremediation不能使removed minerals用于industrial purposes，原文说A harvest of the shoots would remove the toxic compounds off site to be burned or composted to recover the metal for industrial uses. 堆肥后recover metal可以用于industrial uses.与原文opposite。
B=可以更快实施，原文无方法实施上哪个更快哪个更慢的比较。无法推断。
C=phytoremediation与其他方法同样对环境无害，原文an environmentally friendly approach known as phytoremediation.只表明phytoremediation对环境无害，并没有相关信息反映其他方法也无害，not given信息，无法推断。更无环境这方面的比较。
D=楼上那位说的对