The eyeballs become sore and the eye muscles ache because ______. Snow-blindness may be avoided by ______.

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问题 The eyeballs become sore and the eye muscles ache because ______.
Snow-blindness may be avoided by ______.

选项 A、concentration on the solid white area
B、providing the eyes with something to focus on
C、searching for something to look at in snow-covered areas
D、covering the eyeballs with liquid

答案B

解析 从第三段最后两句可知B项为正确答案。
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