①维生素C能促进人体生长发育．下列富含维生素C的是____（填字母）．

A．牛肉    B．辣椒   C．鸡蛋

②缺乏某种微量元素将导致甲状腺肿大，且造成智力损害，该微量元素是____

A．碘    B．铁     C．钙

④使用青霉素可能会产生过敏，在用药前患者一定要进行____．

说理：____．

在横线上填上合适的数．

3个 $\frac{1}{8}$ 是____．

$\frac{7}{9}$ 里有____个 $\frac{1}{9}$ ．

$\frac{5}{12}$ 是____个 $\frac{1}{12}$ ．

   A small town named Bundanoon in Australia has decided to stop the sale of bottled water(瓶装水). They say that bottled water can cause environmental problems. Too many resources(资源) are used to make bottled water. When people finish drinking the water, the bottles will be thrown away and go into dustbins. So they require local people in the town to stop buying bottled water and use tap water to drink. Visitors are encouraged to get water from water stations in the main streets, and fill the water in bottles that can be used again. The decision has been supported(支持) by all the shopkeepers in the town. Bundanoon is the world’s first town that has got its shop selling bottled water. Probably we should follow the example. Let’s stop buying bottled water and use tap water！