我国南方某地新建一小型水库，某日两时刻测得水库及其东西两侧气温分布如下图所示，据此回答下面小题。

    As if 2016 hadn't been hard enough for China's workforce, a yearly survey has revealed that more than half of the country's white-collar employees got no year-end bonus ahead of the upcoming and costly lunar(农历的) New Year holiday. The survey of 11,500 workers by Chinese employment agency Zhaopin found that 50.9 per cent did not get an annual bonus at the end of 2016. Another 9.6 percent were told their bonuses had been delayed until after the New Year holiday.

    Before the slowdown that began in 2014, employers in China had been less ungenerous with cash bonuses, which can total well over a full month's pay and send employees back home for the holiday with plenty of cash for gifts to elders and other family members or to put away as savings. The impact of weak growth on year-end bonuses may have reached the highest point in 2015, however, when 66 per cent of white-collar workers received no year-end bonuses. And the 2016 level actually represents an improvement from 2014, when 61 per cent had to go without.

    But that recovery has also seen the size of bonuses drop: last year the average bonus was Rmb 12,821（$1,861）, about Rmb 2,000 more than that in 2015 but still about Rmb800 below the 2014 average. More than a quarter of those surveyed who saw their bonuses drop last year blamed the drop on poor company performance.

    Differences among the 34 cities surveyed were still greater, as the average bonus of over Rmb 15,800 in Beijing was more than three times than that in the lowest-paying city of Shenyang. Employees of state-owned firms also expressed more satisfaction with their bonuses than those at private companies — and little wonder, as the average bonus at the former was Rmb 17,318, or about Rmb 6,000 more than what private companies' employees could expect.

    But the impact of companies' stinginess(吝啬) can go beyond simply ruining employees' New Year holiday, possibly coming back to affect employers: 39 percent of respondents said they would look for work elsewhere if their year-end bonus was not returned to normal, an increase of 2.3 Percentage points from 2015.

下面是九年级某位同学在学习第一、二次工业革命有关内容时制作的表格：

某班同学在完成综合性活动“科海泛舟”的过程中，搜集到如下材料。请你按照要求，回答小题。

       材料一：2005年，我国20个省市自治区发生大面积电荒，这个数字在2006年被刷新，这年共有25个省级电网拉闸限电，仅国家电网公司系统就拉闸限电80多万次，高峰时段电力供需缺口达2000万至3000万千瓦。湖南省5天停电9652次，时间是2005年12月19日至23日。据专家预算，如果从2000年开始计算，5年来“电荒”给国民经济造成的直接和间接损失已超过1万亿元人民币。

       材料二：石油，是现代社会生存的血液。从1997年始，中国从石油输出国变成了进口国。2004年，中国的石油需求在2．7亿吨上下。但产能只有1．7亿吨。2005年，中国石油需求量达到2．9亿吨左右，有可能超过日本而成为仅次于美国的世界第二大石油消费国，但中国石油产量并未大幅度提高。从1999年净进口量4000万吨，到现在的超过1亿吨，中国对进口石油的依存度将达37%。2010年，中国的石油需求将达3．2亿吨，届时石油进口量将达1．6亿吨，进口量将超过国内需求的一半。

       材料三：可再生资源以其独特的魅力吸引了世界的目光。可再生资源包括风能、太阳能、生物质能等。在我国，风能拥有量居世界第二，太阳能拥有量居世界第一，生物质能拥有量居世界前列。苍天给了我们一笔无比丰厚的财富。