問題詳情

31-36：
A vast majority of people in the world move their eyeballs countless times each day and think nothing of it. For a British man named Stephen Mabbutt, nonetheless, this seemingly insignificant action created a great deal of noise in his head. He could clearly hear his eyeballs moving whenever they did so. And those weren’t the only bodily actions he could hear. Mabbutt also heard his own heart beating, and the sound of him chewing his food was deafening. Needless to say, all those noises were quite an annoyance to him.
It turned out Mabbutt had a rare inner ear condition called “superior canal dehiscence syndrome,” or SCDS. The ailment was only discovered in 1995 and affects just one in 500,000 people in Britain every year. SCDS occurs when one of the bones in the ear doesn’t develop fully. As a result, the bone is too thin and can’t properly support one of the three main canals in the ear. This adversely affects people’s vision and hearing, as Mabbutt found out.
Luckily for Mabbutt, SCDS is treatable. In July 2011, he underwent surgery to fix the problem. Mabbutt, who had suffered from SCDS for six years before the condition was finally determined, was understandably delighted following his operation. He said that he felt like he “had a new lease on life.”
What is the main cause of SCDS?
(A) The loss of hearing and sight.
(B) The noise of the moving of the eyeballs.
(C) The thinness of one of the bones in the ear.
(D) The absence of one of the three ear canals.

參考答案

答案：C
難度：簡單0.764706
統計：A(1),B(7),C(39),D(4),E(0)

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