阅读下列短文，从每题所给的四个选项中，选出最佳选项。

    A teenager has gained a six-figure sum for a vampire (吸血鬼) novel she wrote after being inspired by the Twilight. Abigail Gibbs, 18, who started writing the book aged 14, released chapters of her novel online, where the book eventually received 17 million hits. Harper Collins in Britain has now signed this talented author following her extraordinary Internet success.

    Miss Gibbs, from Brixham, Devon, who is about to start studying English at Oxford University, is the first author to be discovered on Wattpad. Wattpad is an online library which allows subscribers (用户) to upload or read other people's stories. Miss Gibbs also said Stephenie Meyer's famous Twilight books had influenced her novel, The Dark Heroine. “I read the Twilight and did really enjoy it. At first, my parents were a bit opposed to my writing because I was staying up till 3 a.m. on school nights and they were worried that I might fall behind.”

    Miss Gibbs finished her book at the age of 16. She posted each chapter after she had written it on the Internet site, until she got to five chapters before the end when she stopped. “I had signed with an agent and he basically said, ‘Don't post anymore so as to keep the readers' anxiety”. That was tough because I disappeared in the site for a year and there were a lot of fans asking where I was. I have had so many requests from fans to upload the last five chapters; some people even said they were going to write their own endings.” Her fans can buy the e-book for ￡2.99, or wait for the paperback book priced at ￡6.99 in shops next month.

阅读下面文章，完成文后题目。
                                                                                低碳与城市生活（张华）
        ①低碳经济更需要城市居民的低碳生活方式，需要低能量、低消耗、低开支的生活方式。
        ②丹麦哥本哈根市是城市绿色能源和绿色出行的典范，市民摒弃汽车，习惯用自行车或地铁等环保方式出行。哥本哈根以其风力发电出名，城市内共有5600座风车，为丹麦提供了l0％的发电量。
        ③瑞典马尔默是“明日之城”住宅示范区，住宅区供暖空调利用海水和地下水能量，市内交通重点在于推广使用自行车，多条公共交通线路将市中心和城市边缘地带连接在一起，便利出行。马尔默已成为世界上不多的100％能源来自可再生能源的市镇。
        ④加拿大温哥华鼓励采用风能、太阳能、潮汐能等清洁能源，连垃圾压实机都采用太阳能为动力。温哥华限制建私人停车场，且停车库与住宅分开销售，以此鼓励居民多多使用公共交通工具或者自行车。
        ⑤由此可见,低碳生活宜因地制宜，根据所在国家、城市的不同能源特点选择合适的低碳生活能源结构、城市交通规划和出行模式，促进居民形成良好的低碳生活习惯。
        ⑥与低碳生活友好的电力来源可以是当地的核电、水电、风能、太阳能和生物质能等低碳能源，并且选择高效用电设备。   
        ⑦人类活动需要交通工具，而交通工具也是能耗和排放大户，汽车的燃油只有13％用于牵引，另外87％被发动机本身、等红绿灯或者塞车所损耗。同样，选择交通工具也非常重要，乘坐出租车碳的排放量是坐公共汽车的7倍，是乘地铁的14倍。由此看来，城市的交通规划和人们的出行习惯也会影响碳排放。从能源消耗来讲，选择公共交通工具出行更有利于减排。
        ⑧城市建筑能耗占城市用电的三分之一，建筑采暖空调、照明、办公设备等用电量大。工作场所尽量采用自然光和少开灯，夏季空调温度不要太低而冬季供暖室内温度不要太高等良好的工作习惯将减少建筑用能。
        ⑨借鉴国外城市发展经验,培育城市居民良好的低碳生活方式,让城市生活更美好。

在黄土高原的缓坡上修筑梯田是该区域综合治理的一项措施。梯田田埂的水平延伸方向一般(    )