1980年，我国建立4个经济特区；1984年，开放14个沿海城市；1985年，开辟沿海经济开放区；1992年，决定开放内地部分省会城市、沿江沿边城市；2001年，加入世界贸易组织；2013年，设立上海自由贸易区。以上史实主要说明我国（    ）

指南针最早用于航海事业，开始于（  ）

美国“全国步枪协会”拥有四百万名会员，民间共有枪支两亿支，持枪人数达六千五百万。该协会称，公民持有枪支不受限制是其奋斗目标。这反映的问题是：                           （   ）

下列有关阿伏加德罗常数N_A说法正确的是（   ）

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