[求助]LAST-10-2-17

17.   Certain instruments used in veterinary surgery can be made either of stainless steel or of nylon. In a study of such instruments, 10 complete sterilizations of a set of nylon instruments required 3.4 times the amount of energy used to manufacture that set of instruments, whereas 50 complete sterilizations of a set of stainless steel instruments required 2.1 times the amount of energy required to manufacture that set of instruments.

If the statements above are true, each of the following could be true EXCEPT:

(A) The 50 complete sterilizations of nylon instruments used more energy than did the 50 complete sterilizations of the stainless steel instruments.

(B) More energy was required for each complete sterilization of the nylon instruments than was required to manufacture the nylon instruments.

(C) More nylon instruments than stainless steel instruments were sterilized in the study.

(D) More energy was used to produce the stainless steel instruments than was used to produce the nylon instruments.（B）

(E) The total cost of 50 complete sterilizations of the stainless steel instruments was greater than the cost of manufacturing the stainless steel instruments.

能讲讲为什么选B吗?没看懂以前的解释~

1。原文有一处错误：10 complete sterilizations of a set of nylon instruments 。。。应为50 complete sterilizations of a set of nylon instruments

2。对could be true EXCEPT题。答案和原文矛盾。原文真，正确选项必错。

3。原文第二句话意思为：对每套N仪器，50次消毒用的能量是生产它所需能量的3.4倍。所以每次消毒用的能量小于生产它所用的能量。B却相反。故必错。