题目

______ I came home，my son was writing a composition．A. While B. WhenC. As D. How 答案：【答案】B【解析】句意：当我回家时我儿子在写作文。根据I came home和my son was writing a composition之间的关系，可知是当……时候；when、while、as表示“当……时候”时，when可以和延续性动词连用，也可以和短暂性动词连用；而while只能和延续性动词连用；as后面的动作和主句的动作同时发生，一般翻译为Once in a blue moon there is one on New Year's Eve. Revelers ringing in 2010 will be treated to a so-called blue moon. According to popular definition, a blue moon is the second full moon in a month. But don't   1   it to be blue - the name has nothing to   2   the color of our closest celestial（天体） neighbor. A full moon   3   on December 2. It will appear again on Thursday in time for the New Year's countdown. "If you're in Times Square, you'll see the   4   moon right above you. It's going to be that brilliant," said Jack Horkheimer, director emeritus of the Miami Space Transit Planetarium and host of a weekly astronomy TV show. The New Year's Eve blue moon will be   5   in the United States, Canada, Europe, South America and Africa. For partygoers in Australia and Asia, the full moon does not show up  6   New Year's Day, making January a blue moon month for them. However, the Eastern Hemisphere can celebrate with a partial lunar eclipse（月蚀） on New Year's Eve when  7   of the moon enters the Earth's shadow. The   8   will not be visible in the Americas. A full moon occurs   9   29.5 days, and most years have 12.  10  , an extra full moon in a month - a blue moon - occurs every 2.5 years. The   11   time there was a lunar double take was in May 2007. New Year's Eve blue moons are rarer, occurring every 19 years. The last time was in 1990; the next one won't   12    again until 2028. Blue moons have no astronomical   13   , said Greg Laughlin, an astronomer at the University of California, Santa Cruz. "`Blue moon' is just a   14   in the same sense as a `hunter's moon' or a `harvest moon,'" Laughlin said in an e-mail. The popular definition of blue moon   15   after a writer for Sky & Telescope magazine in 1946 misunderstood the Maine Farmer's Calendar and marked a blue moon as the second full moon in a month. In fact, the calendar   16   a blue moon as the third full moon in a season with four full moons, not the usual three. Though Sky & Telescope corrected the  17   decades later, the definition caught on. For purists（语言纯正癖者）, however, this New Year's Eve full moon doesn't even qualify as a   18   moon. It's just the first full moon of the winter season. In a tongue-in-cheek essay   19   on the magazine's Web site this week, senior contributing editor Kelly Beatty wrote: "If skies are clear when I'm    20  celebrating, I'll take a peek（眯着眼睛看） at that brilliant orb（天体） as it rises over the Boston skyline to see if it's an icy shade of blue. Or maybe I'll just howl." (   ) 1. A. wish            B. wait                 C. hope             D. expect (   ) 2. A. deal with       B. do with          C. develop with     D. form into (   ) 3. A. occurred        B. came                 C. ran          D. went (   ) 4. A. full            B. half                 C. bright       D. part (   ) 5. A. out of sight        B. visible          C. big          D. clear (   ) 6. A. until           B. when                 C. before       D. since (   ) 7. A. part            B. all              C. any          D. none (   ) 8. A. moon            B. eclipse          C. sun          D. shadow (   ) 9. A. each            B. every                C. either           D. all (   ) 10. A. On the whole   B. Generally speaking   C. On average   D. In addition (   ) 11. A. last           B. next                 C. other            D. another (   ) 12. A. go             B. see              C. come             D. look (   ) 13. A. point          B. evident          C. theory       D. significance (   ) 14. A. name           B. object           C. phenomenon   D. tradition (   ) 15. A. created        B. came about       C. made             D. copied (   ) 16. A. named      B. called           C. introduced       D. defined (   ) 17. A. error          B. name                 C. reality      D. number (   ) 18. A. blue           B. red              C. yellow       D. grey (   ) 19. A. published      B. posted           C. printed      D. written (   ) 20. A. in             B. out              C. away             D. on