花费不菲的海归留学生就业现状到底怎么样？日前，启德教育联合前程无忧、应届生求职网共同发布了《2017海归就业力调查报告》，调研数据显示，海归第一份工作平均起薪约为10.8万元，年收入在8万元以下的占比最集中，大约有四成。总的看来，多数海归、尤其是没有工作经历的海归收入与国内大学毕业生相差不多。关于留学究竟“值不值”的话题，一直在舆论场上有争议。

对此，你有何看法？请综合材料内容及含意作文，体现你的思考与判断。要求：选择好角度，确定立意，明确文体，自拟标题；不要套作，不得抄袭。

阅读理解

    No Car Day was first started by 34 cities in France on September 22, 1998. It was started to protect the environment. By now, more than 1,000 cities around the world have had a No Car Day.

    The first No Car Day in China was in Chengdu in 2001. Other cities, including Taipei, Shanghai and Wuhan, also support the day.

    In Beijing, more and more people are joining the campaign. It asks drivers to leave their cars at home for one day each month and walk or ride a bike to work. It also calls on Beijingers not to use cars on June 5(World Environment Day). The slogan for the day is, “If we drive for one less day, we can have one more nice day.”

    So far, more than 200,000 drivers have shown their support. “We can't control the weather, but we can choose not to drive,” said Wu Zonghua, a car club chairman. Beijing is trying to have 238 blue sky days this year. In the first quarter of 2012, Beijing only had 52 blue sky days. This was 11 days less than the number for the same period the year before. Much of the dust comes from the desert, but cars cause most of the air pollution. We must do more for No Car Day.

如图所示，拿一个与头发摩擦过的气球接近放在桌面上的空易拉罐，会发现空易拉罐动起来，这是因为气球带了____ 具有吸引轻小物体的性质．如果把封口松开，气球将由静止开始运动，这说明____ ．松手后看到气球会升空，这时气球受到的浮力____ （填“大于”、“等于”或“小于”）重力．