[求助]晕菜,两道没方向的题

lazykid

题一: 一个country的工业化程度越高,诱发癌症的因素的数量越会increase,结果the incidence of cancer 在这个country也会提高的更快
问以下哪个是对支持原文最无说服力
a.Some of the most potent carcinogens tend not to be produced until a country becomes more industralized.
b.Increases in the incidence of cancer correlate to increase in the percentage not the number of carcinogens in the country.

key:b but why?

题二: The truly interesting question facing advocates of space exploration is whether we should explore space in order to further our understanding of space itself, or to discover practical applications useful to us here on Earth. This question continues to compel, since, despite the fact that the definition of useful on Earth has become more far-reaching in recent years, utility alone may not justify the cost of space exploretions.

which one of follwoing statement can most logically inferred from the statement.
a. The notion of what is useful on Earth is not necessarily costant.
b. It is , by and large, fair to say that space exists to be used by humankind.
c. It is irrational to argue that space should be explored even if it proves to be unprofitable for humans
d.potential usefulness to humankind is the only meaningful criteia in considering whether to explore space
e. In order to justify the cost of space exploration, we must show that space is worth understanding for its own sake.

key: a
那位能帮我解释以下,题干到底是什么意思?

lyricling

偶觉得第一题的答案应该是E。因为原文提到的都是数量，而E项给的是percentage.致癌物的数量时，其percentage有可能不变，这不能支持原文结论：致癌物数量增加－－＞incidence of cancer增加。

第二题考的就是一句话：despite the fact that the definition of useful on Earth has become more far-reaching in recent years。
more far-reaching 提示现在的情况与原来的情况是不一样的。所以得到A项。
（这道题有点像阅读考题。）