成人英语三级考试阅读理解模拟题精选25
Many people believe the glare from snow causes snowblindness. Yet, dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snowblindness,when exposed to several hours of snow white”.
The United States Army has now determined that the glare from snow does not cause snowblindness in troops in a snow-covered country. Rather, a man’s eyes frequently find nothing to focus on in a broad expanse of barren snow-covered terrain. So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscles ache. Nature offsets this irritation by producing more and more fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until vision blurs, then is obscured, and the result is total, even though temporary, snowblindness.
Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of 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 too can focus. The man following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop scouring 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 solid white terrain is overcome.
1. To prevent headaches, watering eyes and blindness caused by the glare from snow, dark glasses are ________.
A. indispensable
B. useful
C. ineffective
D. available
Best Answer:C
详解:答案C。依据文章第一段第二句:然而当你连续几个小时站在雪地里,不管你戴了墨镜还是没戴墨镜,人们会觉得自己正在忍受着头疼,眼里充盈着泪水甚至雪盲。故答案为C。
2. The eyeballs become sore and the eye muscles ache because _______.
A. tears cover the eyeballs
B. the eyes are irritated by blinding sunlight
C. the eyes are irritated by blinding snow
D. there is nothing to focus on
Best Answer:D
详解:答案D。依据文章第二段第二、三、四句:在一望无垠的雪地上,人的眼睛捕捉不到任何可注视的目标,因此,为搜寻到可注视的目标,在这一望无垠的雪地上,他的目光在不停地移动,由于找不到可注视的目标,眼睛会不停地搜寻,因此渐渐地眼球会很疼,眼部肌肉也会隐隐作痛。故答案为D。
3.Snowblindness may be avoided by______.
A. concentrating on the solid white terrain
B. providing the eyes with something to focus on
C. searching for something to look at in snow-covered terrain
D. covering the eyeballs with fluid
Best Answer:B
详解:答案B。文中第二段指出finding nothing to focus on是造成雪盲症的真正原因,而第三段进一步指出将注意力集中在某一物体上才是防止雪盲症的有效方法,故答案为B。
4. 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
Best Answer:A
详解:答案A。依据文章第三段:走在大部队前面的尖兵都受过训练,他们在穿越被白雪完全覆盖的原野时,会将长青灌木上面的雪抖落。…跟在后面的人就有东西可看。他们的目光就会被吸引。故答案为A.
5. A suitable title for this passage would he ________.
A. Snowblindness and How to Overcome It
B. Nature’s Cure for Snowblindness
C. Soldiers in the Snow
D. Snow Vision
Best Answer:A
详解:答案A。依据全文:第一段讲雪盲的存在,第三段讲雪盲的形成,第三段讲克服雪盲的办法。故答案为A。