单选题
Where Have All Our Visitors Gone?

Sixty years ago, a man named Kenneth Arnold saw something that people are still (51) today, something that changed popular culture for ever.
Flying his plane over mountains in the US state of Washington, he saw a line of strange objects, either crescent -shaped or disc-like, flying (52) the motion of a saucer skimming on water.
The media soon picked up on the story--the Flying Saucers were here! Was the earth being (53) by creatures from another planet? Soon, so many sightings were made that the US military began to (54) . It called these strange objects UFOs Unidentified Flying Objects, and that is how they are (55) today.
Military investigations found no evidence of visitors from outer space. But that did not stop the true (56) . The military were (57) up, they said. Or (58) it was because the travelers from space were of such superior intelligence that they could hide from the most sophisticated military analysts.
People have always seen strange lights in the sky. In the past these were explained in (59) ways. In a world where religion was less influential and science fiction was popular, signs from god were replaced by visitors from other (60) .
The date of the first UFO signings was also significant. In 1947, World War II had just ended and the (61) war was just beginning. Humanity seemed locked in endless conflicts. Like generations before them, people looked (62) the skies for help. But instead of seeking God, they looked for help from super-intelligent aliens with (63) technology. Belief in UFOs became the first religion of science.
However, even people who believe in UFOs are not quite sure why they visit the earth. The universe is a big place and it is (64) to assume that there is life somewhere out there. It is possible that aliens have worked out how to travel through space. Yet some people report that they have been-taken by aliens and have had experiments (65) on them. Why would anyone travel across half the universe to conduct medical experiments on people living in small towns in the United States?

【正确答案】 B
【答案解析】see和look、seek这三个词的根本区别在于see有一个终点(end point)，而look和seek是没有终点的。句子相关部分说的是“某物人们今天仍然看得见的”。注意“看得见”和“看见”是有终点的，但是“看”没有。因此，用seeing而不用looking和seeking。
【正确答案】 C
【答案解析】四个词都是介词。其中below、underneath和under是方位介词；with是方式介词。由于the motion不是方位，因此应选择with。句子相关部分说的是：……以碟子飞速掠过水面的移动方式飞着。
【正确答案】 D
【答案解析】rule：统治；bombard：轰炸；capture：夺取；visit：访问。第3段的第1句话说的是：军事调查并没有发现证据，可以说明从外层空间来了客人了。visitor(客人或访问者)是visit(访问)的派生名词，因此用visited比较好。
【正确答案】 A
【答案解析】investigate：调查；attack：攻击；shoot：射击；confront：对峙。想到军队，我们就会想到他们会攻击、射击入侵者或跟与敌人对峙。但是根据第3段第1个句子中“：military investigations”提供的线索；我们应该选择investigate。
【正确答案】 C
【答案解析】有些读者很可能选择called。这没有错。但是这样的话整个句子只是重复了上一句的信息，而用了known意义上就不再重复。
【正确答案】 A
【答案解析】believers：相信的人；thinkers：思想家；followers：追随者；liars：说谎者。可以看出，最合适的词是believer's。
【正确答案】 B
【答案解析】hide：藏起来；cover：掩盖；cheat：欺骗；trick：欺骗。从中文翻译来看，这几个词似乎都可以，但是只有cover可以跟up搭配，因此选择covering。
【正确答案】 D
【答案解析】definitely：肯定地；undoubtedly：毫无疑问地；necessarily：必定地；maybe：可能。相关句子的关键词是or(或者)，表示两种情况都有可能，因此只有用maybe在语义上才是一致的。
【正确答案】 C
【答案解析】awkward：笨拙的；crude：生硬的；religious：宗教的；foolish：傻的。从紧随其后的句子“In a world where religion was less influential…”(在一个宗教的影响不如以前的……世界里)，可以看出合适的选项是religious。
【正确答案】 A
【答案解析】planet：行星；continent：洲；county：国家；region：地区。本文的主题是讲不明飞行物，也就是讲来自外星球的人，因此合适的选择是planets。
【正确答案】 D
【答案解析】cool：凉的；star星球；nuclear：核；cold：冷。正确地回答这道题需要一点世界历史知识。第二次世界大战结束后冷战开始，因此选择cold是正确的。提出星球大战(star war)的是里根。核战争(nuclear war)如果发生的话，文明早就消失了。cold war是冷战。
【正确答案】 B
【答案解析】这四个都是介词：above：上；to：对；at：在；up：上。look above：往上看；look to：依赖；look to…for…：在……方面依赖。因此，to是合适的选择。相关的句子说的是：跟先辈们一样，人们乞求上天来帮助他们。look at：看，动作没有终点。look up：往上看，当然也还有其他的意思。
【正确答案】 D
【答案解析】traditional：传统的；backward：落后的；classical：古典的；advanced：先进的。如果真有外星人来拜会我们的话，那么他们的技术要比我们先进，这个推理可以帮助我们选advanced。
【正确答案】 C
【答案解析】unthinkable：不可想象的；impossible：不可能的；reasonable：合理；insensible：不知道的。上一句说的是：宇宙是一个很大的地方。从这句话我们有理由假设在那儿有生命的存在，因此选reasonable是对的。
【正确答案】 A
【答案解析】perform：做；carry：拿；bring：带；take：拿。这是这四个词的基本意义。根据它们的基本意义，用performed比较合适。如果用carried的话需要加out。