①常常能听到这样一种说法:人的脑子用多了,会死掉许多细胞、人脑多用了会笨,这种说法是没有科学道理的。
②事实上,人的肌体的各个部位,几乎都是越用越健康,脑子也是一样。让我们先来看一个数据:经科学家研究证明,人的大脑皮层,大约有140亿个神经细胞,也叫神经元。这么多数量的脑细胞,对一个人的一生来说,足够足够了。有人计算过,如果一个人活到100岁的话,经常运用的脑神经细胞只不过10多亿个,还有80%90%的脑细胞没动用。所以,根本不会有什么脑子多用会笨的事情。
③生命在于运动,这是生物界的\'一个普遍规律。人的机体,用则灵,不用则衰;脑子用得勤的人,肯定聪明。因为这些勤于用脑的人,脑血管经常处于舒展的状态,脑神经细胞会得到很好的保养,从而使大脑更加发达,避免了大脑的早衰。相反,那些懒于用脑思考的人,由于大脑受到的信息刺激比较少,甚至没有,大脑很可能就会早衰。这跟一架机器一样,搁在那里不用就要生锈,经常运转就很润滑。外国就有过这样的研究,科学家观察了一定数量的2070岁的人,发现长期从事脑力劳动的人,到了60岁时仍能保持敏捷的思维能力,而在那些终日无所事事、得过且过的懒人当中,大脑早衰者的比例大大高于前者。
④除了懂得脑子多用只会聪明、不会笨的道理以外,我们还应该了解多用脑、可防老的道理。这对老年人来讲尤为重要。我们常说,大脑是人体的司令部,如果大脑迟钝了,身体各器官的生理功能当然也不会旺盛。所以,保持大脑的活力,就能促进其他机体、器官保持活力;大脑如早衰,也会影响其他机体器官的早衰。老年人的健康状况,往往是生理、心理、环境等因素互相影响的结果,老年人保持着勤于用脑的好习惯,就会有一种很好的心理状态,可以使自己的生活、精神充满活力。
⑤勤于用脑,延缓衰老,这个道理是很科学的。老年人如此,何况我们青少年呢?让我们大家养成勤于用脑的良好习惯吧。
18.用自己的话对第②段中画线部分的内容进行概括。(1分)
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19.第③段中画线的部分综合运用了______________________________等说明方法,说明了____________________________________________________的道理。(2分)
20.第④段说明多用脑,可防老的道理,谈了两方面的原因:一是生理方面的,就是多用脑能够____________________________________________;二是心理方面的,就是多用脑可以___________________________________________。(2分)
21.人的机体的各个部位,几乎都是越用越健康,这句话中的几乎能删去吗?为什么?(2分)
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22.把全文分为两个部分,请用‖划出。(1分)
① ② ③ ④ ⑤
23.你在生活中也经常用脑,读了这篇文章,有些什么?(2分)
_______________________________________________________________ ____
参考答案:
18.人的脑神经细胞足够一生运用。 19.作诠释、作比较、打比方。脑子用得勤(的人),肯定聪明。或:脑子多用只会聪明(不会笨)。20.促进其它肌体、器官保持活力; 使生活、精神充满活力。 21.不能删去。几乎表明并非全部,也有例外,删去后不能表达出这层意思。 22.①②③║④⑤ 23.本题鼓励学生各抒己见,只要符合题意,言之成理即可给分。
1. Nancy is too young to dress herself.
Nancy is not _____ _____ to dress herself.
2. My watch doesn't work well.
There is ____ _____ _______ my watch.
3. Jane doesn't go to work by bus any longer.
Jane ____ _____ _____ to work by bus.
4. It took Mary two weeks to prepare for the exam.
Mary _____two weeks____ ______ for the exam.
5. It seems that they have known each other.
They seem to _____ _____ each other.
6. "My grandpa doesn't like coffee or coke" said Bob
Bob said that _____grandpa liked _____coffee _____coke.
7. Cao Fei joined the League three years ago.
Cao Fei _____ ____ _____ the League for three years.
8. I prefer walking there to going by bus.
I prefer to walk there ____ _____ going by bus.
9. -Thank you very much. -You're welcome.
- ____ a lot. -Not at____ .
10. Kitty does well in English.
Kitty ____ ____ ____ English.
11. They realized Hainan was a beautiful place after they reached there.
They____ realize Hainan was a beautiful place_____ they reached there.
12. We will have to finish the work hardly if you don't help us. We can't finish the work _____ _____ ______
13. My dictionary isn't so thick as yours.
My dictionary is _____ than yours.
14. Could you tell me where the East Street Hospital is? Excuse me, ____ is the _____ to the East Street Hospital?
15. The book is exciting to read.
It is ____ _____ read the book.
16. Jack's mother asked him, "Have you packed your things?" Jack's mother asked him ____ he ____ packed his things.
17. She likes singing better than dancing. She ____ singing ____ dancing.
18. Remember to ring me up as soon as you get to Nanjing Make ____ to give me a ring as soon as you _____ Nanjing.
19. They couldn't catch the train because of the heavy traffic. The heital?
15. The book is exciting to read.
It is ____ _____ read the book.
16. Jack's mother asked him, "Have you packed your things?" Jack's mother asked him ____ he ____ packed his things.
17. She likes singing better than dancing. She ____ singing ____ dancing.
18. Remember to ring me up as soon as you get to Nanjing Make ____ to give me a ring as soon as you _____ Nanjing.
19. They couldn't catch the train because of the heavy traffic. The heavy traffic _____ them from _____ the train.
20. My brother has been away from home for two days.
My brother _____ home two days _____ .
21. Li Lei decided to move to Canada when he was thirty.
Li Lei made a _____ to move to Canada at the _____ of thirty.
22. Jim was too careless to pass the exam last term.
Jim was not_____ _____ to pass the exam last term.
23. If you don't hurry up, you can't catch the train.
Hurry up, _____ you may _____ the train.
24. Yang Li wei said to us, "I'm going to visit your school tomorrow. " We were all pleased.
We were all pleased when we heard Yang Li wei_____ visit_____ school the next day.
25. This is the most interesting film I have ever seen. I have ____seen _____ an interesting film before.
26. I was late for school because of the traffic accident. The traffic accident _____ me _____ getting to school on time.
Therearesomecherriesinthebasket.(一般疑问句,否定回答划线部分提问Kittylikesthebluedress.(用thepinkdress改为选择疑问句Don`tplaywithfires.(换一种说法
Joelikesreading.Dannylikesreadingtoo.(把两句连成一句Pleaseeatsomecakesandbiscuits.(改为否定句划线部分提问Thereissomewaterintheglass.(划线部分提问划线部分提问Whatdayistoday?
What`sthedatetoday?
Whatdoyouusuallydoafterdinner?
Whichpearsdoyouwant,thegreenonesortheyellownoes?Whichwesternholidaydoyoulikebest?Whenisit?
WhatdoyoudoattheLanternFestival?
5B2
Thosebooksareours.(同义句划线部分提问划线部分提问
ThosecrayonsareDanny`s.(.(用Alice改为选择疑问句Arethesetheirschoolbags?(单数句划线部分提问
Theyridetheirbicyclestothepark.(用May改写
Thecocooniswhite.(用browng改为选择问句划线部分提问Heisfouryearsold.(改为一般过去时
Iwasathomeyesterdayevening.(改为一般疑问句
Thecaterpillarslikeeatingleaves.(改为单数句划线部分提问划线部分提问
WhatdoyoueatattheMid-autumnFestival?(根据实际情况回答
1. It is fun at school.
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2.I like grapes.
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3. Miss Green is a good English teacher.
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4. Norman likes maths.
改成否定句__________________________________________
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5. Jim is watching TV.
改成否定句__________________________________________
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6.There are so many animals.
改成否定句__________________________________________
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肯定回答_____________________________________________
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7.I can hear something in the next room.
改成否定句__________________________________________
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8. I’ve got the letter“n”.
改成否定句__________________________________________
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9. MMike has got a picture of Shanghai.
改成否定句__________________________________________
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10.There’s a big playroom in our school.
改成否定句__________________________________________
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11. They have got some bananas.
改成否定句__________________________________________
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12. Tom and Jim are watching a match.
改成否定句__________________________________________
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肯定回答_____________________________________________
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13. I want some carnations for my mother.
改成否定句__________________________________________
改成一般疑问句______________________________________
肯定回答_____________________________________________
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14. Those are roses.
改成否定句__________________________________________
改成一般疑问句______________________________________
肯定回答_____________________________________________
否定回答_____________________________________________
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