第二部分：英语知识及运用（共两节，满分35分）
第一节：完形填空（共10小题；每小题2分, 满分20分） 
阅读下面短文，从短文后所给各题的四个选项A、B、C和D中选出能填入相应空白处的最佳选项。
Rubber ducks are being used to help scientists understand global warming and melting glaciers. NASA researchers have  21   90 ducks into holes in Greenland's fastest moving glacier, the Jakobshavn Glacier between Greenland and Canada. The   22   have each been marked with the words "science experiment" along with an e-mail address. If they are found scientists will be able to  23   how the water moves through the ice and provide information about the   24   of glaciers. Scientists are still   25   about why glaciers speed up in summer and head towards the sea. One theory is that as the summer sun melts ice on top of the glacier's surface, the water moves to the bottom of the glacier, where it helps to   26   the movement of ice toward the coast. The Jakobshavn Glacier is believed to be the   27   of the iceberg that sank the Titanic in 1912. Robert Jones, the experiment organizer, said none of the ducks had been   28   yet. "We haven't heard back but it may take some time until somebody actually finds it and decides to send us a/an   29   that they have found it," he said. "These are places that are   30   so there aren't people walking around."
21. A. flown                 B. buried               C. hidden                     D. dropped
22. A. results            B. toys               C. glaciers          D. scientists
23. A. remember       B. invent            C. learn                 D. control
24. A. development    B. movement           C. growth        D. travels
25. A. unsure          B. excited          C. concerned       D. ignorant
26. A. reduce          B. control        C. speed         D. stop
27. A. position               B. source            C. reason            D. result
28. A. hurt                 B. eaten              C. missing         D. reported
29. A. email            B. card                  C.    fax          D. sign
30. A. hidden          B. lost                C.    remote       D. quiet