Mary loved small animals. One morning while she was walking in the forest, she found 1weak birds in the grass. She took them home and put them in a small cage. She cared them with love and the birds both grew2. They thanked her3a wonderful song every morning.

    But something happened one day. Mary left the door of the 4open. The larger bird flew from the cage. She thought that it would 5. As it flew close, she grasped (紧抓) it. She was very 6to catch it.7she felt strange. She opened her hand and looked sadly at the 8bird. Her great love had killed the bird!

    The other bird was moving back and forth (来回) in the cage. Mary could 9its great need for freedom (自由). It wanted to fly into the clear and blue10. At once, Mary took the bird 11the cage and let it fly away. The bird circled once, twice, three times…

    Mary enjoyed watching the bird flying and singing 12 Suddenly the bird flew13and landed softly on her head. It sang the 14song that she had ever heard.

    The easiest way to lose love is to hold it too tight. The best way to keep love is to 15it wings (翅膀).

下表列出了某种型号轿车的部分数据，试根据表中数据回答问题。

表格右侧图为轿车中用于改变车速的挡位．手推变速杆到达不同挡位可获得不同的运行速度，从“1～5”逐挡速度增大，R是倒车挡。试问若轿车在额定功率下，要以最大动力上坡，变速杆应推至哪一档？以最高速度运行时，轿车的牵引力约为多大（    ）

①1月16日，50余位国家元首、政府首脑和国际组织主要负责人，数以千计的全球商业精英纷至沓来，出席世界经济论坛2017年年会。

②在大众传播媒介高度发展的今天，“名人”辈出，而过去要成为名人必须在某一领域出类拔萃，才能通过薪火相传、书籍记载等方式广为人知。

③在跨年雾霾中，防霾产品种类繁多，花样翻新，但是经科学研究证明，许多被宣传得天花乱坠的产品纯粹是无稽之谈。

④此次重污染天气已经是今年的第四轮，但是仍然有一些大企业甚至是央企对按照预案要求的时段实施限产、停产措施置若罔闻，拒不执行。

⑤特朗普早在大学时代就孜孜不倦地汲取商业领域新知，加上父亲耳提面命的教诲，年轻的特朗普就已蠢蠢欲动，欲在商界闯出一片天地。

咖啡树喜温暖湿润的气候和湿度较大且排水良好的土壤。中国%%以上的咖啡来自云南．而云南的咖啡六成以上来自普洱．普洱出产的咖啡豆以其优良的品质成为顶级咖啡的制作原料。近年来，普洱市政府积极引导农户扩大咖啡树种植面积，部分农户甚至将 茶园改为咖啡树种植园。普洱现已成为全国最大的咖啡树种植地区和咖啡加工区。下图示意普洱市的位置和地形。