唐代取士，  ①  看考试成绩，  ②  有达官显贵或文坛名人的推荐。  ③  ，考生纷纷奔走于公卿门下，向他们投献自己的代表作，这叫投卷。向礼部投的叫公卷，向达官贵人投的叫行卷。投卷  ④  能使有才能的人显露头角，如诗人白居易向顾况投诗《赋得古原草送别》，受到老诗人的极力称赞，  ⑤  弄虚作假、欺世盗名的  ⑥  不乏其人。

党的十八大以来，脱贫攻坚取得显著成绩，2013至2016年短短四年间，累计脱贫5564 万人。2017年中央要求各地根据实际进行创新，精准、高效完成扶贫任务。要解决我国贫困人口问题，最根本的途径是（    ）

    Which is the best city in Europe? Each city has its own special features. It depends on what a person likes and dislikes. Now let's see the three most popular cities in Europe.

London, the United Kingdom

    If you like ale（麦芽酒）, or you are interested in history, you will like this city. The best time to visit London is from May to October. You can visit the British Museum, the Tate Modern and Westminster Palace.

Amsterdam, Holland

    People who like art will like this city. And it is also a great place to go bike riding. In April or May you can see many beautiful tulips（郁金香）there. July and August are the best two months to visit. The Royal Palace and the Van Gogh Museum are great places to see.

Paris, France

    Tourists who love art or traditional food will like this city. Spring is the best time to visit. Summer is also a good time. The Louvre, The Eiffel Tower and the Montparnasse are the greatest places to visit.

一幅画中适当留下不着色彩的空白，更能达到一种“恰是未曾着墨处,烟波浩渺满目前”的境界。“空白效应”说明了（   ）。