已知非零向量 $\overrightarrow{a}$ 与 $\overrightarrow{b}$ ，那么下列说法正确的是（   ）

阅读下面短文，从各题所给的选项中选出最佳答案。    

    Liu Lin, a student at Chengdu University, made a big decision last August. She decided to take her 93-year-old grandmother from their hometown and to 1 with her in a rented room not far from the university.

    Why did she do so? Because many  2 things happened to her family last year. In March, her grandmother broke her leg. In April, her father passed away. Her mother, plagued(折磨) by these 3 , lost the ability to take care of others.

    This was the only choice for her 4 no one else could care for her grandmother. The old woman's three sons have all died, and Liu Lin couldn't leave5 alone at home where nobody could look after her.

    A room with two beds, a wardrobe(衣柜), a desk and a table is their new 6  in Chengdu. The room costs 600 yuan per month. Liu Lin's younger brother works in the same city and  7 most of his 2,000 yuan salary(工资) supporting the family.

Liu Lin and her brother were brought up by their  8 . Even though she could not read a clock, their grandmother prepared lunch on time every day when they were 9. They think it's their turn to look after her now.

    Liu Lin has  10  a work-study program from the university to help support the family. She reduces help from others. At present, the girl is able to support the family.

阅读材料，完成下列要求。

    2015年7月31日，国际奥委会主席巴赫宣布，北京获得2022年冬奥会举办权。北京将成为奥运历史上第一个既举办过夏季奥运会，又举办冬奥会的城市。此次申奥成功，对北京的公共文化基础设施建设和市民素质的提升提出了内在要求，也对增强我国的软实力和提高中国的国际形象和地位，特别对中华民族复兴和“中国梦”产生重大影响，将会更加证明和巩固中华民族在世界民族之林的地位。

    对于本次冬奥会的申办，虽有稳固的支持率，但也出现了一些质疑的声音。

    支持者认为：“在京津冀协同发展的大背景下，借助顶级体育赛事的平台，促进整个区域的一体化进程。”“申办冬奥会是顺势而为，体现了公众需要，也与城市功能定位相契合。”“将有力推动我国冬季项目的普及。”

    质疑者认为：“北京很缺水，又基本没雪，怎么办冬奥会？…冰雪项目在我国参与人数较少，缺乏大众基础。”