题目

“倒车，请注意！”路人听见提示音后，可以及时躲避车辆，避免了交通事故的发生（如图）。下列叙述中，正确的是（） A . 听觉形成在耳蜗中 B . 路人听到倒车提示音进行躲遍，属于非条件反射 C . 该反射活动的神经中枢位于脊髓 D . 这种反射使人体更好地适应外界环境 答案：D 第二部分  阅读理解 （共25小题；每小题2分，0分）          阅读下面短文，掌握其大意，然后从21~45各题所给的四个选项（A、B、C、D）中，选出最佳选项，并在答题卡上将该项涂黑。 Passage A    Visitors from space may have landed on our planet dozens, even hundreds of times during the long, empty ages while Man was still a dream of the distant future. Indeed, they could have landed on 90% of the earth as recently as two or three hundred years ago, and we could never have heard of it. If one searches through old newspapers and local records, one can find many reports of strange incidents that could be interpreted(解释) as visits from outer space. A winter, Charles Fort, had made a collection of UFO sightings in his book. One is tempted(引诱) to believe them more than any modern reports, for the simple reason that they happened long before anyone had ever thought of space travel. Yet at the same time, one can’t take them too seriously, for before scientific education was widespread, even sightings of meteors(流星) and comets(彗星) gave rise to the most unbelievable stories, as they still do today. 1. According to the passage visitors from space may have landed on the earth _____. A. long before man had dreamed of it   B. long before there were human beings C. in the last few hundred years        D. after the space age began 2. According to the passage, which of the following statements is true?   A. All observations of UFO’s are believable   B. Charles Fort sighted a lot of UFO’s himself   C. Older civilization (文明) may exist on other planets   D. People have seen visitors from other planets everywhere 3. If visitors from other planets have actually landed on the earth, one can suppose that they came to __________________.    A. make war      B. communicate       C. settle down     D. explore 4 The passage implies that the space age has __________________. A. made the reported sightings unbelievable    B. increased the number of UFO sightings C. allowed more scientific study of UFO’s     D. given clearer pictures of UFO’s 5. According to the passage, __________________. A. UFO’s are only recent observations         B. UFO sightings are not new C. UFO’s are just meteors and comets          D. UFO’s are invented by people