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 __14__ 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 __15__ on them. Why would anyone travel across half the universe to conduct medical experiments on people living in small towns in the United States?

　　词汇：

　　crescent n.月牙，月牙形物 saucer n.碟

　　skim v.飞速掠过 alien n.外星人

　　练习：

　　1. A) looking B) seeing C) seeking D) feeling

　　2. A) below B) underneath C) with D) under

　　3. A) ruled B) bombarded C) captured D) visited

　　4. A) investigate B) attack C) shoot D) confront

　　5. A) named B) called C) known D) dubbed

　　6. A) believers B) thinkers C) followers D) liars

　　7. A) hiding B) covering C) cheating D) tricking

　　8. A) definitely B) undoubtedly C) necessarily D) maybe

　　9. A) awkward B) crude C) religious D) foolish

　　10. A) planets B) continents C) countries. D) regions

　　11. A) cool B) star C) nuclear D) cold

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