Unit4  Making the news

答案：not only does he teach english but he teaches how to learn english well.
三、單元自測
1.完形填空
閱讀下面短文，掌握其大意，然后從21—30各題所給的a、b、c和d項(xiàng)中，選出最佳選項(xiàng)，并在答題卡上將該項(xiàng)涂黑。
詞數(shù)：205 完成時(shí)間：14分鐘 難度：
rubber ducks are being used to help scientists understand global warming and melting glaciers(冰川). 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 towards 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 many 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 up     d. stop
27. a. position   b. source      c. reason       d. result