题目

右图是元素周期表前四周期的一部分，关于元素R、W、X、Y、Z的叙述正确的是( ) A．最高价氧化物的水化物的酸性：W＞Y   B．Z的单质常温下是液体，所在的周期中含有32种元素 C．Z的原子序数比R大17 D．氢化物的沸点：X＜Z 答案：C   What can you do to keep healthy? Perhaps for children,healthy eating is one of the most important things. Here are some ideas about how to eat h 91   .Having breakfast   A good breakfast is very important to children. It's necessary to have it in the m 92   But some children often go to school w 93  breakfast,just because they want to sleep a little longer. Remember that a good breakfast will help you study better.Having milk   “My dream is that all the Chinese children can get half a kilogram of milk a day”’ The former Chinese Premier (前总理) Wen Jiabao said this during his v 94   to a milk farm. Milk is also very important to children's health. It makes children grow stronger. It's better for you to d 95   a glass of warm milk b 96   going to bed. That will help you have a good sleep.Having healthy food    Having healthy food is the most important. That means eating lots of different k 97   of food,especially fruits and vegetables. Don’t eat too much chocolate o 98  ice-cream. Some of you e 99   fast food,but in fact it is not good for your health. Try to eat healthy food as much as possible.   Have healthy eating habits (习惯) ，and you will have a s 100  body.91.   92.   93.   94.   95.   96.   97.   98.   99.  100.