题目内容
Which number is the odd one out?
解析：
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All the others are multiples of 7． |
学练快车道口算心算速算天天练系列答案My son loves video games very much. He spends hours every day playing video games in his room. Is there any redeeming（补偿的）educational value to video games? Some seem like they could help him learn strategy. But I worry others may be too violent or numb（使麻木）his mind.
Cecilia
Some games may improve kids’ hand-eye coordination and problem-solving skills. Games that require kids to actually move or manipulate（操纵）the game through their own physical movement can even get sedentary kids moving, though not as much as they could if they actually played outside or participated in sports or other outdoor acuities. Others, though, don’t have such benefits, and violent video games have been shown that they might increase kid’s aggressive behavior.
Like a lot of aspects of raising kids, when it comes to video games, the healthiest approach is actually self-control.
The American academy of Pediatrics(AAP) recommends that kids should spend no more than 2 hours each day on screen time, including watching TV or movies, or playing computer or video games. So consider setting limits at least that strict to keep game playing from affecting their schoolwork, household responsibilities, and the physical activity your son needs very day.
Make sure that he’s playing games which are suitable for his age group. All video games are rated and labeled by the Entertainment Software Rating Board. Steer clear of（避开）any rated “M” for mature. Those are for ages 17 and older and can contain heavy-duty violence, strong language, and sexual content.
Try to keep the video game console（游戏机控制板）in a common area of the house, not your son’s room. That way you can catch any inappropriate content in the games he’s playing, and he’ll be in a position to interact with others in the house while he’s playing.
Make sure your son has appealing alternatives, too, such as sports, activities, opportunities to socialize with peers; and downtime to be creative. If you continue to have concerns about his video game activity, talk with your doctor.
Reviewed by：Mary L. Gavin, MD
【小题1】What is the opinion of Mary L. Gavin about playing video games?
| A．Whether it’s beneficial or harmful depends on what the video games are. |
| B．It always improves kids’ hand-eye coordination and problem-solving skills. |
| C．It will make kids more violent and increase their aggressive behavior. |
| D．Kids should give it up and put their hearts fully into their schoolwork. |
| A．unhealthy | B．lively | C．bright | D．inactive |
| A．Keep the video game console out of their house. |
| B．Allow their children to play only such video games as rated “M” |
| C．Let kids play video games as much as possible if it doesn’t affect their lessons. |
| D．Help their children develop other healthy hobbies such as sports and painting. |
| A．Should children play video games? |
| B．Kids’ playing video games is harmful. |
| C．Is playing video games good for kids? |
| D．Help children choose video games. |
The whole body is covered with skin.The surface of the skin is dead(like the hair and the nails),but it is made from a living layer(层)just under the surface.The outside dead layers wear off(磨损)all the time,with new ones replacing them,and the body forms a totally new skin every three weeks.
The skin protects the body from the outside world and it passes information from the outside.It helps to keep water in the body and to keep the body at the same temperature.Becteria(细菌)can’t get in through the skin unless it is damaged.
If the weather is cold,the blood vessels(血管)in the skin squeeze down,or contract(收缩),so that as little blood as possible comes near the surface.This means that less warmth is lost to the outside.This makes the skin look pale,or even “blue”.At the same time,the hairs on the skin are pulled upright by tiny muscles.
When it is hot,the blood vessels expand(扩大),or get wider again,to allow plenty of blood to run near the surface of the skin.This helps the body to lose heat,and the skin may look red.At the same time,the sweat glands(汗腺)produce more sweat,which cools the skin.
If your skin has ever been numb(麻木的),you will realize how important the feeling from the skin is.Nerves(神经)in the skin are sensitive(敏感的)to heat and cold,sharpness,hardness and softness,wetness and dryness and pain.If one is not able to feel these things,which can act as warnings,he is likely to be burned,cut or hurt in other ways.
The colour of the skin depends on special colour cells(细胞).These are just below the top layers of the skin.They are needed as protection from some harmful ray of the sun.The stronger the sun is,the more important it is to have a dark skin.People with pale skins may “tan”(晒黑)in the sun.This happens when the body produces extra colour cells in the skin for protection.In the sun,the skin produces a vitamin(vitamin D)which is needed for strong bones.
1.Which of the following statements is NOT true?
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A．Our hair and nails are dead like the surface of the skin. |
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B．There is skin all over our body. |
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C．The skin of our bodies will be completely different in three weeks. |
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D．The surface of the skin is made of a living layer. |
2.The second paragraph mainly tells us about______.
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A．the functions of the skin |
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B．the information from the outside |
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C．the water in the body |
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D．the temperature of the body |
3.Bacteria will get in through the skin______.
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A．when one’s skin is numb |
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B．when one is ill |
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C．when the skin is cut |
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D．when the sweat glands produce more sweat |
4.When the weather is cold,the skin will contract in order to______.
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A．allow more blood near |
B．make the skin look blue |
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C．keep warmth |
D．help the body lose heat |
5.The colour of the skin is determined by______.
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A．the rays of the strong sun |
B．colour cells |
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C．top layers of the skin |
D．vitamin D |