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问题 选择题

下列物质的用途中，利用了其物理性质的是（　　）

A．用碳酸氢钠治疗胃酸过多

B．用大理石作建筑材料

C．用熟石灰改良酸性土壤

D．用稀盐酸除去铁锈

答案

A、用碳酸氢钠治疗胃酸过多，是利用了碳酸氢钠能与胃酸发生化学反应，需要发生化学变化就能表现出来，是利用了其化学性质，故选项错误．

B、用大理石作建筑材料，不需要通过化学变化才表现出来，是利用了其物理性质，故选项正确．

C、用熟石灰改良酸性土壤，是利用了熟石灰能与酸发生化学反应，需要发生化学变化就能表现出来，是利用了其化学性质，故选项错误．

D、用稀盐酸除去铁锈，是利用了稀盐酸能与铁锈发生化学反应，需要发生化学变化就能表现出来，是利用了其化学性质，故选项错误．

故选B．

阅读理解
 
Dear Expert:
I was asked to retrieve my 14-year-old daughter from a five-day camping trip.She was suffering from such severe separation anxiety,her teacher thought she should go home.She hadn’t eaten anything and had refused to participate in any activities.The thing is my daughter is extremely bright and has many friends;she organized a few friends into a band,and it belongs to several school clubs.She’s just always had an extreme fear of being away from home.I don’t want her to miss out on other trips.
Yours truly,
Jonathan
 
Dear Jonathan:
Sometimes kids can push through homesickness,but in other instances they become hurt mentally and develop greater anxiety around outings,which can worsen and prolong(延长) the problem.Separation anxiety can be the result of many complex interactions some genetic(遗传的) and some learned. People with high anxiety tend to be fearful and worried, ever when the sense of threat is minimum（最低程度）.Lots of talented,creative and successful people are exceedingly anxious.
I believe your daughter is bright,active and popular,but simply can’t do well outside her home base.My suggestion is to take things in small steps,so your daughter can experience success,and always have a fallback(退却) plan if she needs it.For instance,she can plan an overnight with a friend,but assure her it’s no big deal to pick her up at midnight if she changes her mind. What’s important is to recognize the fear,and make plans to deal with whatever may cause distress.In other words,don’t try to talk your daughter out of her fears,equip her to master them.This way she’ll eventually gain the confidence to go on further trips.
Expert
 
小题1:What does the underlined word“retrieve”mean?
A．Go with someone.B．Take someone back.
C．Separate from someone.D．Miss someone.
小题2:Which of the following statements is TURE?
A．Separation anxiety is the result of different reasons.
B．Separation anxiety is genetic.
C．Only creative people suffer from separation anxiety.
D．Separation anxiety is of the same level.
小题3:When can’t the 14-year-old daughter function well?
A．When organizing a band at school.
B．When she is not far away from her home.
C．When she is in a club.
D．When she is camping far away from home.
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