问题 填空题

在2010年5月31日山东电视台的《生活帮》节目中,播报了某些网吧给通宵上网的学生提供磷酸可待因糖浆,使学生短时兴奋,但长期服用会导致学生食欲减退、情绪易激动且吸食成瘾的恶果.已知磷酸可待因的化学式为:C18H21NO3•H3PO4•H2O.试回答下列问题:(提示:CuSO4•5H2O的相对分子质量计算式为64×1+32×1+16×4+5×(1×2+16×1)=250)

磷酸可待因由______种元素组成;其相对分子质量为______;磷酸可待因分子中氢、氧两种元素的质量比为______.

答案

根据磷酸可待因的化学式C18H21NO3•H3PO4•H2O  可知磷酸可待因由:C,H,N,O,P 五种元素组成;

磷酸可待因的相对分子的质量为:(12×18)+21+14+(16×3)+3+31+(16×4)+2+16=415;

磷酸可待因分子中氢、氧两种元素的质量比为:(1×26):(16×8)=13:64;

故答案为:五;  415;  13:64.

阅读理解

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Parenting has never been an easy job,but mothers and fathers today face challenges in raising their children that their own parents may never have had to deal with

While children have always been particular eaters,for example,parents today are trying to supply healthful food in a world full ofchicken nuggets,processed snacks and soft drinks.Bike riding and hopscotch have given way to video games and text messaging.And working parents have to cope with all things around day care,jobs and family.

At the same time,a large amount of health information on the Intemet and elsewhere has introduced a higher level of stress for parents.Web sites provide supplemants(补品)that increase a child’s brain health while news organizations report on the latest scare from baby bottles or too much television.

All of this makes raising a healthy child overwhelming.But it doesn’t have to be.

This Well guide offers small steps and simple ways to improve a child’s well-being in four

areas—nutrition,development,playtime and safety Inside,there’s advice from experts on how to raise a healthy,active youngster;tips on diet and behavior,help for problems like insomnia,and the latest thinking on day care,discipline and other topics.It’s all designed to help kids stay well every day.

45.According to the author,what is most likely to be found in today’s homes?

A.Hopscotch     B.Healthful food.  C.Bike riding.  D Brain supplements

46.What does“Well guide'’in the last paragraph probably refer to?

A.A programon how to deal with daily affairs

B  A game on how to make kids clever.

C.A book on how to raise a child.

D A site on how to reduce work stress

47.From the 1st paragraphinthe passage,we can infer that_______

A.today’s parents are too busy to raise their own children

B  today’s parents should seek advice from their own parents

C  it was much easier to raise children in the past

D.parents have more concems in raising children today

48.The underlined word in Paragraph 4 can be replaced by          .

A.relaxing       B.delighting      C.stressful     D puzzling

单项选择题