若不等式组$\left\{\begin{array}{c}x\ge 0\\ x+3y\ge 4\\ 3x+y\le 4\end{array}\begin{array}{c}\\ \end{array}\right.$所表示的平面区域被直线$y=kx+\frac{4}{3}$分为面积相等的两部分则k的值是（  ）

中华传统文化是中华民族智慧的结晶，内涵丰富，源远流长。阅读材料，回答问题。

材料一：为政以德，譬如北辰，居其所而众星共之。

——《论语》

材料二：从后来的历史看，中国最重要的改革之一是废弃了早先在诸王国发展起来的写法众多的语言文字，而代之以全中国都能理解的统一文字。这种统一文字……证明是一种非常有效且持久的统一的粘合剂。

——斯塔夫里阿诺斯《全球通史》

国际油价的飙升，导致汽车使用成本增加，为此，英国、法国等欧洲国家，都开始大力推广自行车出租服务，掀起了一场小型交通工具革命，人们对汽车的使用趋于下降。这一现象反映出（  ）
①一种商品（服务）的价格上升，会导致其替代品需求量的减少
②价格对高档耐用消费品的影响比较大
③人们对一种商品的需求，受其互补商品价格的影响
④一种商品（服务）的价格上升，会导致其互补商品需求量的减少

19. They didn't _____ the wedding because of a heavy rain.

阅读理解

    Many other people and I in Britain love charity shops because we can find them on every street．The charity shops sell all kinds of things and they are very cheap．

    The first charity shop was opened by Oxfam in 1947．Now there are over 7,000 charity shops in the UK．My favorite charity shop in my hometown is the Cross Shop．There I always find children’s books，all 10 to 20 pence each．They are really cheap．

    Most of the shop workers in charity shops are volunteers，    each shop has a manager and he gets some money．Every morning you see bags of things outside the shops．Some people bring and put them there without waiting for thanks．In fact，over90％of the things in charity shops are from kind people．

    All the money the shops get goes to charity work．Charity shops raise more than 110 million pounds every year．The money is for sick and poor children。homeless and disabled people，and many others．In a charity shop you can get cheap but nice things．You might even feel special while shopping．

    If possible，let’s do something for charity together．

根据短文内容，完成下列各题。