题目内容
Many people believe the glare(炫目的光)from snow causes snowblindness. Yet, with dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snowblindness ,when exposed to several hours of“ snow light”.
The
Experiments led the Army to a simple method of overcoming this problem. Scouts(侦察兵)ahead of the troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow - covered landscape. Even the scouts themselves throw lightweight, dark - colored objects ahead on which they can focus too. The men following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop searching the snow -blanketed landscape. By focusing their attention on one object at a time. the men can cross the snow without becoming hopelessly snowblind or lost. In this way the problem of crossing a continuous white land is overcome.
72.To prevent snowblindness caused by the strong light from snow, wearing glasses or not ________.
A. depends on whether the snow is white enough
B. makes no difference
C. makes much difference
D. depends on whether the snow is thick
73.When the eyes are tired, tears flow out ________.
A. to clear the vision
B. to make the eyes stop searching
C. to make the vision unclear
D. to produce more and more liquid
74.Snowblindness can be avoided ________.
A. by moving one’s gaze back and forth
B. by walking ahead and keeping looking around
C. by making up for the discomfort of one’s eyes
D. by providing the eyes with something to focus on
75.What is the probable meaning of the underlined part “Their gaze is arrested” (in paragraph 3 ) ?
A. They get something to look at.
B. They can only look at one spot.
C. Their eyes are clear.
D. They can’t see freely.
73.C 第二段结尾部分说此时泪水流出来充满眼眶,眼睛看不清,导致雪盲。
74.D 第三段提到的侦察兵的做法告诉我们,雪盲的产生是因为在雪地里眼睛找不到具体目标,由于寻找不到看的物体才产生雪盲。人们就将灌木上的雪去掉,扔一些深色物体,其目的是D。
75.A 划线句子后面说“眼睛盯着灌木,找到东西可看”,因此选A。