3. Monocular vision enables the kingfisher to__________________.
A) avoid farsightedness B) be able to see underwater
C) move one eye at a time D) focus its eyes on the prey
4. A bee finds its direction by_______________________.
A) dividing what it sees into thousands of dots
B) constantly gauging its flying speed
C) using the sun as a constant point of reference
D) measuring the angle of the sun
5. What is the main idea of the passage?
A) The differences between human eyes and other species eyes.
B) The advantages of other species eyes in comparison with human eyes.
C) The factors that make other species eyes better than human eyes.
D) The standard that determines me perfect vision of human eyes.
选项翻译与答案详解
1.Snellen视力表是通过什么来测量一个人的视力的?
A)受试者能够看清的行数。 B)受试者离视力表距离的远近。
C)受试者识别字母的速度。 D)几个综合的因素。
首段第2句中的lines of letters和第3句中的bottom line表明视力的好坏是依靠看到视力表的行数来决定的,选项A为本题答案。首段第2句表明测验视力时距离是预先设定的,选项B不正确;选项C属于无中生有,原文并未提及该内容;文中只提到视力的好坏取次于能看到多少行字母这一因索,并没有提到其他因素,故D项错误。
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