地处干旱区的宁夏银川市，其周边地区曾广布湖泊，明清时有“七十二连湖”的说法。20世纪80年代银川周边湖泊所剩无几。1999年开始，银川实施恢复湿地的计划。下图示意银川周围目前的湖泊分布。据此完成下面小题。

如图，∠AOB的一边OA为平面镜，∠AOB=37°36′，在OB上有一点E，从E点射出一束光线经OA上一点D反射，反射光线DC恰好与OB平行，则∠DEB的度数是（　　）

阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
A
Live Music—-Late Night Jazz
    Enjoy real American jazz from Herbie Davis, the famous trumpet(号手). He is known to play well into the early hours, so don't want to get much sleep.

PLACE: The Jazz Club     DATES: 15—-23 June PRICE: ￥100-150        TIME: 10 p.m. till late!   TEL: 4668736

Scottish Dancing
    Scottish dancing is nice and easy to learn. The wonderful dance from England will be given.

PLACE: Jack Stein's      DATES: 10-20 May PRICE: ￥150           TIME: 7-10 p.m.  TEL: 4021877

Shows—-Anhui Museum
    There are 12,000 pieces on show here. You can see the whole of Chinese history.

PLACE: Anhui Museum    DATES: 1Mar-30 Jun PRICE: ￥130            TIME: Mon-Fri 9 a.m-5 p.m.   Saturday 9 a.m.-9 p.m. TEL: 4886888

    Your pen friend is coming from Australia to your city for a holiday. You send him this E-mail to tell him something about the hotels.

SUN HOTEL Dates                Prices(a night) 1Oct-31Dec             ￥168 1Jan-31Mar             ￥148 1Apr-30Apr(closed)       …… 1May-31May            ￥188 1Jun-30Sep              ￥208 TEL: 4686788   E-mail: Li Hong@163.com.

ROSE HOTEL Prices(a night) ￥198 ￥178 …… ￥218 ￥248

在5.12四川汶川地震救灾中，人民子弟兵从直升飞机上抛下救灾物资，救灾物资在加速下落时（   ）

下列烷烃的命名正确的是