求助：逻辑大全I-12

mslancaster

大全-Ⅰ-12.    A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data notes that the bacterium thrives in the presence of a certain virus, implying that it is actually the virus that causes the new disease.
Which of the following pieces of evidence would most support the data’s implication?
(A) In the absence of the virus, the disease has been observed to follow infection by the bacterium.
(B) The virus has been shown to aid the growth of bacterium, a process which often leads to the onset of the disease.
(C) The virus alone has been observed in many cases of the disease.
(D) In cases where the disease does not develop, infection by the bacterium is usually preceded by infection by the virus.
(E) Onset of the disease usually follows infection by both the virus and the bacterium.

I thought the answer is B, however the key answer is C, why is it?

mslancaster

恳请各位NN指点！非常感谢

lshlccER

12题
是为了测试这种病是病毒引起的还是细菌引起的
所以最直观的检测就是把他们两个分开做实验，看看到底是谁引起的
所以C最直接
B不如C直接，B说先感染病毒，在感染细菌，就是说细菌也有可能起到引起疾病的作用
这是我找到的。。。。。但是自己也不太认同

running2k

同意楼上，方法就是削弱bac的作用，加强virus的作用
A.削弱了virus的作用，加强了bac的作用
B.不能看出到底谁影响。
同理，别的选项都可以用这个方法排除。除了C,它加强了virus的作用