[求助]TTGWD9-21

Q21:

Driving the steep road to the mountaintop Inca ruins of Machu Picchu is potentially dangerous and hiking there is difficult.  Now the Peruvian government is installing a cable car that will make access much easier, and hence result in a large increase in tourism.  However, since the presence of large numbers of tourists tends to accelerate the deterioration of a site, installation of the cable car is certain to result in harm to the ruins.

Which of the following, if true, most seriously calls into question the argument?

1. The daily number of tourists that are expected to take the cable car to Machu Piccu is smaller than the original resident population of Incas.
2. The construction of the cable car terminal at Machu Picchu will require the use of potentially damaging heavy machinery at the site.
3. Machu Picchu is already one of the most popular tourist sites in Peru.
4. Natural weathering will continue to be a more significant cause of the deterioration of Machu Picchu than tourist traffic.
5. The cable car will replace the tour buses whose large wheels and corrosive exhaust at present do significant damage to the site.

答案是E。 E不能削弱结论“installation of the cable car is certain to result in harm to the ruins” 呀。如果这样的话，D也是对了的。E只能说在cable car 将取代已经对这个旅游区造成了损害的大BUS，但不能削弱cable car将要 引来更多游客再损害旅游区的理由啊。

比较困惑。

这道题是太简单还是太难回答了？