When the eyes are sore, tears are produced to_________

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单选题 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

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。

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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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