试题与答案

下列关于溶液的说法正确的是( ) A.从一杯质量分数为10%的食盐溶液中倒出一半

题型:选择题

题目:

下列关于溶液的说法正确的是(  )

A.从一杯质量分数为10%的食盐溶液中倒出一半,余下的溶液质量分数为5%

B.某饱和溶液降温后析出晶体.此时它就变成不饱和溶液

C.向某物质的饱和溶液中加少量该物质.恒温下放置一定时间后,溶液中溶质的质量分数变大

D.稀溶液可能是饱和溶液,浓溶液也可能是不饱和溶液

答案:

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                                                               IMPROVE ON SLEEP

      Good health needs good sleep. Going to bed before you're tired. Not eating or reading in bed. Go to bed at

the same time before midnight and get up at the same time. Your body likes routine (常规) for a good night's

sleep. 

                                                                  

                                                                STAY FREE OF FLU

      Studies show that a cold or flu virus (病毒) can live on our hands for long. So wash all parts of your hands

often with soap and water. For more ways to prevent the spread of flu, please call. HealthLine at 1800 848 1313.

                                                                     

                                                               ORAL (口腔) HEALTH

      Brush your teeth twice daily and visit the dentist at least once a year. The mouth is a mirror of disease. The

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                                                                      FIT FOR LIFE

      Studies have shown that many diseases have something to do with less or no physical (身体) activity. Try

to do it for 30 minutes a day, 5 days or more a week. For more information, please call HealthLine at 1800 438

2000.

                                                                  

1. If you want to get a good sleep, you'd better _______. [ ]

A. go to bed after you're tired

B. go to sleep at midnight

C. follow the bedtime routine

D. eat something or read in bed

2. To prevent from catching a cold or flu, it's good for you _______. [ ]

A. to clean your fingers often

B. to brush your teeth twice daily

C. to get up early every morning

D. to wash all parts of your hands

3. You should visit the dentist at least once a year, because _______. [ ]

A. the oral examination is necessary

B. you don't often brush your teeth

C. some diseases may be in the mirror

D. you don't have a good night's sleep

4. Studies have shown that many diseases have something to do with _______. [ ]

A. having no oral examination

B. washing hands with cold water

C. sleeping too late sometimes

D. doing little physical activity

5. When you want to learn more about the flu, you can _______. [ ]

A. visit www. mydr. com. au

B. call HealthLine at 1800 848 1313

C. visit the dentist in your place

D. call HealthLine at 1800 438 2000

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