单选题
下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。
{{B}}
UFOs{{/B}}

Sixty years ago, a man named Kenneth Arnold saw something that we can still {{U}}(51) {{/U}} 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 (月牙形的) or disc-like, flying {{U}}(52) {{/U}} the motion of a saucer (碟) skimming (飞速掠过) on water.
The media soon picked up on the story - the Flying Saucers were here! Was the earth being {{U}}(53) {{/U}} by creatures from another planet? Soon, so many sightings were made that the US military began to {{U}}(54) {{/U}}. It called these strange objects UFOs - Unidentified Flying Objects, and that is how they are {{U}}(55) {{/U}} today.
Military investigations found no evidence of visitors from outer space. But that did not stop the true {{U}}(56) {{/U}}. The military were {{U}}(57) {{/U}} up, they said. Or maybe it was because the travelers from space were of such superior intelligence {{U}}(58) {{/U}} they could hide from military analysts (分析家).
People have always seen strange lights in the sky. In the past these were explained in {{U}}(59) {{/U}} ways. In a world where religion was less influential and science fiction was popular, signs from God were replaced by visitors from other {{U}}(60) {{/U}}.
The date of the first UFO sightings was also significant. In 1947, World War Ⅱ had just ended and the {{U}}(61) {{/U}} War was just beginning. Humanity seemed locked in endless conflicts. Like generations before them, people looked. {{U}}(62) {{/U}} the skies for help. But instead of seeking God, they looked for help from super-intelligent aliens (外星人) with {{U}}(63) {{/U}} 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 {{U}}(64) {{/U}} 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 {{U}}(65) {{/U}} 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】上文出现过saw这个动词，这里当然还是填see。六十年前Kenneth Arnold看到了我们今天依然能看到的现象。
【正确答案】 C
【答案解析】flying后面需要的是一个方式状语来修饰flying这个动作，只有with是合适的。With the motion of a saucer skimming on water即：“像飞碟飞速掠过水面般的动作”。其他三个介词加在motion前面这里都不通。
【正确答案】 D
【答案解析】role、bomb、capture的意义分别为“统治、轰炸、捕获”，都不适合此处的意义。当时人们只可能提出“是否有来自另外一个星球的生灵造访地球?”这个问题，所以应该选visit这个动词。
【正确答案】 A
【答案解析】由于这个现象多次被观察到，所以美国军方开始着手调查。其他三个动词 attack，shoot，confront的意义分别是“攻击、射击、面对”，都不符合文章的意思。
【正确答案】 C
【答案解析】美国军方把这些奇怪的物体称为“不明飞行物”，如今它们还是被认为是不明飞行物。
【正确答案】 A
【答案解析】true believers确信者。尽管军方的调查没有发现天外来客的迹象，但这并没有使确信这是外星人的那些人改变想法。这些人只能被称为true believers(笃信者)，而不是thinkers(思想家)，或者followers(追随者)。Runners则和文章的内容完全无关。
【正确答案】 B
【答案解析】cover up是个短语，意思是“掩盖”。这些人认为军方在掩盖事实。
【正确答案】 D
【答案解析】前面出现的such一词是很好的提示，such…that… (如此……以致……)。
【正确答案】 C
【答案解析】所给的四个选项不论从语法的角度还是从语义的角度考虑都可以填入到这个空格里去。但下面的句子给了提示，它讲到在宗教不那么具有影响力的情况下人们会怎么想；回到本句，它讲的是在过去也就是宗教的影响比较大的情况下人们当然会从宗教的角度来解释这个现象了。
【正确答案】 A
【答案解析】planets星球，在宗教不再那么盛行，而科幻又变得流行的情况下，人们不再把这些看作是上帝的踪迹，而用其他星球的来访者的想法取而代之。
【正确答案】 D
【答案解析】注意这个War是大写的，所以不会填入一个像cool，nuclear这样的修饰性的词汇，而应该是一个专用的名称。第二次世界大战结束后世界进入所谓的“冷战” (the Cold War)时期。这个是个常识问题。
【正确答案】 B
【答案解析】look to…for help是一个固定的表达，意为“向某人/某机构等求助”。又如： Wherever they are in trouble，they always look to John for help because he is the oldest among them．(遇到麻烦他们总是向约翰求助，因为他是他们中最大的一个)。
【正确答案】 D
【答案解析】从句子的意思上说，现代人要向智力高超的外星人求助自然要使用先进的技术。所以必然是选advanced。
【正确答案】 C
【答案解析】宇宙浩瀚，因此假设在宇宙的其他地方存在生命是合理的。在四个选项中，只有reasonable的意义是更定的，其他三个词的意义都是否定的。
【正确答案】 A
【答案解析】这里填入的是一个动词的分词形式，修饰名词experiments,句子的意思是：有些人报告说他们曾被外星人抓获，并让他们在自己身上做了试验。和experiment搭配的动词是perform，perform an experiment做实验。其他三个动词都不能这样用。