M5导学案

预习案

Key words and phrases:

1、液体（n）_________________ 2、膨胀（vi）__________________ 3、收缩（vi）________________ 4、物质（n）__________________ 5、混合物（n）_______________ 6、氧气（n）__________________ 7、电（n）___________________ 8、火焰（n）__________________ 9、存在；生存（vi）___________ 10、固体（n）_________________ 11、气体（n）________________ 12、给…加热（vt）_____________ 13、金属（n）________________ 14、钢铁（n）__________________ 15、铁（n）__________________ 16、三分之二___________________ 17、50%______________________ 18、自然的（adj）______________ 19、人造的（adj）_____________ 20、460万_____________________ 21、46亿_____________________ 22、数字（n）_________________ 23、分数（n）________________ 24、百分数；比率（n）_________ 25、小数（n）________________ 26、加（介词）________________ 27、2.5_______________________ 28、在重量方面________________ 29、0.5_______________________ 30、小声说____________________ 31、干吧、说吧、走吧、开始干、前进___________________________ 32、离开_____________________ 33、轮到某人了________________ 34、大众科学_________________ 35、表面（n）_________________ 36、转身_____________________

38、轮到某人做某事了_________________________________________

探究案

1. expand v. 膨胀，伸展，扩大 名词形式为expansion

When you heat a metal, it expands. 当你加热一种金属的时候，它会膨胀。 His face expanded in a smile of welcome. 他的脸上绽开了欢迎的笑容。 expand…into… 把……扩充成为……

Expand this sentence into a paragraph.

2.contract v.收缩；订合同；染（疾病） n.合同，契约 be under contract to… 与某机构订有工作合同 keep a contract 履行合同

sign a contract with sb. 与某人订立契约

When you heat a metal, it contracts. 当你加热一种金属的时候，它会收缩。 It was because of you that we signed the contract. 3. 比较等级结构的用法 as…as…表示倍数句型

1) A is as+ adj.+as B A和B……一样 2) A is not as/so+adj.+as B A不如B……

3) A is half as…as B A是B的……的一半 4) A is …times as…as B A是B的……倍 Tom is as tall as Jack. 汤姆和杰克一样高。

Jack is not so clever as his sister. 杰克不如他姐姐聪明。

This pencil is half as long as that one. 这支铅笔是那只铅笔长度的一半。 Their room is four times as large as ours. 他们的房子是我们的4倍大。 考点一：倍数表达法：

1） A+… times+ adj/adv(比较级) + than B

The number of students in our school is three times larger than that in theirs. 2） A+…times as adj/adv (原级)+as B

This concert hall is four times as large as that one.

3） A+… times the size (height, length, width, depth, etc) of B The new building is four times the size of the old one. 考点二：

1） The+比较级（主+谓），the+比较级（主+谓）。越……越…… The closer you are, the more you will see. 2） 比较级+ and+比较级。越来越…… The girl is more and more beautiful. 考点三：

1） 双方比较表示一方超过另一方时， 用比较级+than The girl is more beautiful than me.

2） 双方比较表示一方不及另一方时，用 less+原级+than 或 not as/so+原级+as The room is less big than that one.= The room is not as/so big as that one. 3） 双方比较表示一方超过另一方的程度或数时，可在比较级前加上副词even, a lot, a bit, still, much, far ,yet ,

等

He works even harder than before.

考点四：“否定词+比较级结构”表示最高级含义 I can’t agree more. 我再同意不过了。

There is no greater love than that of a man who lays down his life for his friends.

巩固案 单项填空1. Professor White has written some short stories, but he is known for his plays. A. the best B. more

C. better

D. the most

2. —Bob’s tape-recorder is so wonderful.

—Mine is at least good, if not .

A. as; better B. twice as much C. the same; the bestD. so; better 3. The factory has produced computers as they did last year. A. twice as many B. twice as much C. as twice as many

D. as twice much

4. —How is the patient now? Is he out of danger? —No, than yesterday, I’m afraid. A. no better B. a little better

C. not worse

D. no worse

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