写出下列单词的复数形式。

①desk____        ②chair____      ③rock____

《珠江三角洲地区改革发展规划纲要(2008～2020年)》指出,珠三角率先建成全面小康社会,初步形成科学发展的体制机制,自主创新能力明显增强,人民生活明显改善,区域城乡差距明显缩小。这表明建成全面小康社会(　　)

①要全面追求经济的增长速度

②要贯彻落实科学发展观

③要建立合理有序的分配格局,消除贫困现象

④要转变经济发展方式,努力实现经济持续健康发展

用五十万分之一的比例尺测得某地图中A、B两点的图上距离为5厘米，其实际距离为____千米。

结合上述材料，回答下列问题：

If you are not happy with China's high Internet fees and slow speed, you are not alone. So is Premier Li Keqiang. On April 14, he said in a meeting that the government should speed up the Internet and lower the fees.

“The first question people ask at a new place is 'Is there WI-FI' because Internet service fees are so high,” said Premier Li. According to a recent survey by CCTV, the average cost of 1GB mobile Internet data per month in China is 100 Yuan, while it is only 60 Yuan in the US and 40 in Japan.

However, high prices don’t necessarily mean good service. The average Internet speed in China was 4.25Mbps（兆比特每秒）in late 2014. South Korea had the fastest average Internet speed-25.3 Mbps. People can download a 1 GB movie within 6 minutes in South Koreas, but in China it would take half an hour.

To improve Internet services, the key is to build more fiber(光纤) networks. Through them we can send text, pictures and videos globally in less than a second, which offer high speed Internet. Besides, the lack of market competition is another problems. Having more operators（运营商）besides China Unicom and China Telecom may lower the prices.