专四专八考试

【单选题】
A、Sunglasses block out only a limited amount of the sun’ s ultraviolet rays that can damage the eye.
B．Sunglasses can only filter harmful rays during total solar eclipses at their greatest magnitude.
C．Sunglasses tend to cause the center of the eye to enlarge allowing in more intense light.
D．Sunglasses should be used when any part of the sun is visibl

网考网参考答案：B
网考网解析：
[详细解答] 对于如何观看日食，报道中提出的第一种办法就是用太阳镜过滤太阳的有害光线，但同时也 指出太阳镜也有它的问题：They should be used when any part of the sun is visible. Sunglasses can block out some of the sun’s ultraviolet rays, but the results can be very deceptive. The eye’s natural reaction to this darken state when wearing sunglasses is to make the pupil larger, which allows in more light and can intensify the damage to your eyes. 这三句恰好与D、A、C选项中的内容相符合，报道中并投有提到过D项，故正确答案应为B。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>