快考试了,请各位帮忙解释一下这两题

是XDF的复习题

170.

In Swartkans territory, archaelogists discovered charred bone fragments dating back 1 million years. Analysis of the fragments, which came from a variety of animals, showed that they had been heated to temperatures no higher than those produced in experimental campfires made form branches of white stinkwood, the most common tree around Swartkans.

Which of the following, if true, would, together with the information above, ptocide the best basis for the claim that the charred bone fragments are evidence of the use of fire by early huminids?

A.B.C(略)

D. Apart from the Swartkans discovery, there is reliable evidence that early hominids used fire as many as 500 thousand years ago.

E. The bone fragments were found in several distinct layers of limestone that contained promitive cutting tools known to have been used by early hominids.

答案是D, 但是光知道50万年前有用火的记录对这个发现没有什么影响吧. 即使考虑到选项与题目要一起使结论成立, E似乎也不可能脱离题目信息单独证明结论.

还有

267. In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but  no more than two inches), light tainfall (ar least a trace, bur no more thatn one inch), or no rainfall. In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rain fall for the year was 20 percent higher in 1990 than in 1910.

if the statements above are true, then it is also possible that in Patton City

A. the number of days with heavy rainfall was lower in 1990 than in 1910.

B. the number of days with some tainfall. but no more than two inches, was the same in 1990 as in 1910.

C. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910.

D. the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910.

E. the average amount of rainfall per month was lower in1990 than in 1910.

感觉没一个选项是对的,莫非我书上的题目是错的?

(因为我没做过大全, 哪位告诉我这两题的讨论连接也行.)