When the eyes are sore, tears are produced to__________.

A．clear the vision

B．remedy snow-blindness

C．ease the irritation

D．loosen the muscles

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参考答案

根据第二段“the eyeballs become sore…Nature offsets this irritation by producing more and fluid which covers the eyeball”可知．眼泪的分泌是为了缓和刺激，故选C。

1 Snow-blindness may be avoided by__________.

A．concentrating to the solid white terrain

B．searching for something to look at in snow-covered terrain

C．providing the eyes with something to focus on

D．covering the eyeballs with fluid

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2 The scouts shake snow from evergreen bushes in order to__________.

A．give the men behind something to see

B．beautify the landscape

C．warm themselves in the cold

D．prevent the men behind from losing their way

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3 A suitable title for this passage would be__________.

A．snow-blindness and how to overcome it

B．nature's cure for snow blindness

C．soldiers in the snow

D．snow vision

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