新GRE小短文阅读练习题七十七

会计考友

Our sunglasses block not only ultraviolet light, which is invisible and severely damaging
to the eyes, but also the visible violet light that closest to ultraviolet light in the spec-
trum.  Experiments have shown that this visible violet light can also be damaging to the
+ U% M. |0 k  D) t. d$ _. Xeyes.  Since all other sunglasses at best block only ultraviolet light, wearing our sun-
glasses will significantly improve eye protection for everyone who spends time outdoors.
$ P! M% P/ `) _" y- s, LWhich of the following, if true, most seriously weakens the argument?
     A   Consumers who buy sunglasses are often more interested in the styling of the
3 F6 U, c; t+ n3 {        sunglasses' frames than in any potential protection to their eyes from the most
! L* l3 \. x2 V) N        harmful effects of sunlight.  
     B   The visible violet light closest to ultraviolet light in the spectrum is not generally
        encountered at intensities strong enough to damage the eyes except under
        laboratory conditions.  
    C   Wearing sunglasses that block the visible violet light closest to ultraviolet light in the
        spectrum will not appreciably affect the sharpness of people's visual images.  
- z+ {& q/ y* H  ~; J# D  D     The experiments mentioned in the advertisement were conducted at a major univer-
$ Z) R! N' b" K0 O4 d3 _        sity by professors who did not plan to have their research used in support of a
        commercial product.  
" M) _0 f: n; ~    E   Some people who have not worn sunglasses on a regular basis enjoy excellent
- x$ H. j% P& e        eyesight into advanced old age.  
答案：B