杜甫《茅屋为秋风所破歌》中关心民间疾苦，同情劳动人民，表现诗人虽身处逆境仍然能乐观向上的诗句是：____，____。

I           TV every day.               

（Ⅰ）求频率分布表中x、y的值，并补全频率分布直方图；

（Ⅱ）在抽取的这100名市民中，按年龄进行分层抽样，抽取20人参加国产手机用户体验问卷调查，现从这20人重随机抽取2人各赠送精美礼品一份，设这2名市民中年龄在35，40）内的人数为X，求X的分布列及数学期望．

B

    Do you shop online with websites like Taobao? The money you pay doesn't go directly to the seller. Instead, it goes through Alipay, which keeps your money for a while. After you receive your goods and click the "confirm receipt" button, Alipay then gives the money to the seller.

    The process is called "third party online payment". There is a transfer station, or a third account, between sellers and buyers to make online shopping safe. Buyers don't need to worry about paying for goods and then receiving nothing. Sellers also get rid of the risk of receiving no money after sending out goods.

    These transfer stations are usually set up by payment service companies such as Alipay, Tenpay and Yeepay. Among them, Alipay is the biggest in China. It has more than 270 million active users, according to Xinhua.

    While most online sellers and shoppers like the third party online payment system, banks are not very happy. That is because companies like Alipay are fighting over money with the banks. Users can invest in financial products through Alipay and make money. Thus lots of people choose to put money in Alipay rather than in banks.

    But WeChat payment is not the same. WeChat doesn't have its own account. When paying through WeChat, the buyers' money goes directly to the sellers. That's why so many people are excited about receiving and handing out "red envelopes" or gift money to their friends on WeChat.

    Whether Alipay or WeChat payment, they are all trying to attract more users and make online shopping easier. These two companies are also promoting payments through fingerprints. New payment methods such as quick response codes have become popular too.