Many people believe the glare from snow
causes snow blindness. Yet, 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 United States Army has now
determined that the glare from snow does not cause snow-blindness in troops in a
snow-covered country. Rather, a man’s eyes frequently find nothing to focus on
in a broad expanse of a snow-covered area. 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 muscle aches. Nature balances this annoyance by
producing more and more liquid which covers the eyeballs. The liquid covers the
eyeballs in increasing quantity until vision blurs. And th A. tears cover the eyeballs B. the eyes are annoyed by blinding sunlight C. the eyes are annoyed by blinding snow D. there is nothing to focus on
[单项选择]A survey was carried out on the death rate of new-born babies in that region, ______ were surprising. A. as results B. which results C. the results of it D. the results of which
[单项选择]In 1914, an apparently insignificant event in a remote part of Eastern Europe ______ Europe into a great war. A. inserted B. imposed C. pitched D. plunged
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