关于一道填空题，请教下大家

yuandefeiyi

Exposure to sustained noise has been claimed to ___ blood pressure regulation in human beings and , particularly, to increase hypertension, even though some reserchers have obtained inconclusive results that ___ the relationship.
Blank I             Blank II
A.sharpen     D.buttress
B.increase     E.obscure
C.impair        F.neutralize
答案：CE
我不明白的是 第一空为什么选C。 and 后面是 increase hypertesion， 我觉得前面也是 increase。。。

sillyhaha

increase hypertension means blood pressure regulation is impaired. The key word is 'regulation', if blood pressure regulation is increased, it should decrease rather than increasing hypertension.

Hypertension means increase in blood pressure.

yuandefeiyi

原来出在
regulation这个词上面。