下列关于月球上的元素和矿藏的叙述，正确的是（     ）

2014年我国企业共发生81宗海外并购，交易额达356.1亿元，比2013年分别增加22．7%、30.1%。在海外并购所涉及的行业中，制造业以极大优势居于首位。对该经济现象的正确解读是（    ）

①海外并购有利于提高资源配置效率

②海外并购可以有效规避国际经济风险

③我国制造业在国际分工中具有全面优势

④跨国公司是我国实施“走出去”战略的有力载体

先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的单词。使短文完整。所填单词必须在答题卡标有题号的横线上完整写出。
     Do you like listening to radio? For some people, listening to radio programs has become a part of their d____ lives. How did this start?
      Radio began as ship-to-ship and ship-to-land c____ . In the early 1900s, several people showed that radio could do more than that. Dr. Lee De Forest, is w____  known as the father of radio. He made the first p____  radio broadcast. As a fan of opera, De Forest wanted to s____  the musical entertainment into homes. His first try was on January 13,1910, from the Metropolitan Opera House (大都会歌剧院) in New York City. However, the signal was not good enough. Only a few listening stations and a____ in the harbor (港湾) area were able to hear this broadcast. Although there was a lot to do to improve, it s____ what radio could do.
    Look at the world around us. Radio broadcasts are e____ . Information now travels at the speed of l____ . Music, news, traffic reports and speeches from world leaders are all on the radio. Can you imagine a world w____ radio?

综合性学习。

    近年来，市民对生态环境的质量要求越来越高。为此，北京市政府做出了启动北京平原造林工程的重大决策。某社区为此要开辟宣传专栏，请你完成下面的任务。

材料一

    森林是一个国家、一个城市重要的底色和名片，也是维护国土生态安全的重要基础，发挥着改善生态环境、美化景观环境、优化居住环境、丰富人文环境、提升投资环境的显著作用。统计数据表明，北京市全市森林覆盖率为37.6%，但是森林主体在山区，平原地区森林覆盖率仅为14.85%。此外，北京平原地区森林资源按树种分布，杨树占的比例过大，占森林面积的比例达60%以上，其他树种如刺槐、侧柏、油松等所占比例还不足40%。

材料二

(数据来源：2012年2月27日《新京报》)

分析上面的图表和文字材料，概括北京市平原地区森林资源的现状。