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高中英语二年级下教案[人教版]:Unit 13 The Properties of Water. 水的性质(四)

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Pre-reading思维拓展 Pick out the subject of each paragraph and use the structures below to make six questions. pick cotton 摘棉花 pick spring tea 采春茶 pick one’s pocket 扒某人的口袋 pick up 拾起;偶然获得,学会;恢复精神;加快速度 pick one’s way 挑中找出每一段的中心话题,用下面的句型,设计六个问题。 pick out 找出,分辨出。例如: Can you pick out your brother in this crowd? 你能在这群人中找出你的兄弟吗? He picked out his sister in the crowd. 他在人群中认出了他的妹妹。 Reading思维拓展 1.The properties of water 水资源 property 近义词: wealth, possession belongingsproperty [U] & [C] 特

Pre-reading

思维拓展 

Pick out the subject of each paragraph and use the structures below to make six questions.

pick cotton 摘棉花

pick spring tea 采春茶

pick one’s pocket 扒某人的口袋

pick up 拾起;偶然获得,学会;恢复精神;加快速度

pick one’s way 挑中

找出每一段的中心话题,用下面的句型,设计六个问题。

pick out 找出,分辨出。例如:

Can you pick out your brother in this crowd?

你能在这群人中找出你的兄弟吗?

He picked out his sister in the crowd.

他在人群中认出了他的妹妹。 Reading

思维拓展 

1.The properties of water 水资源

property 近义词:

wealth, possession

belongings

property [U] & [C] 特性,性质;财产,资产。例如:

lose one’s property 失去财产

real property 不动产

Do you know who he left all his property to?

你知道他把全部财产留给谁了吗?

Many plants have medical properties.

许多植物具有疗效。

range [C] & [U] 列,排;范围,区域。例如:

There is a range of mountains in my hometown.

我家乡有一相连不断的雄伟山脉。

This gun has a range of 300 meters.

这支枪的射程是300米。

思维拓展 

2.Life in the oceans ranges from the tiniest plankton all the way up to giants like sharks and whales.

海洋中的生物小至浮游生物,大至鲸和鲨鱼。

(1)range vi. 变动、变化 vt. 排列,将……排成行。例如:

The prices of the dolls range from $5 to $100.

那些布娃娃的价格从5美元到100美元不等。

She ranged the books on the shelves.

她把书架上的书排列好了。

They ranged themselves in rows.

他们排成列。

(2)all the way 一直,从头至尾。例如:

He drove all the way from Canada to Mexico.

他从加拿大一直开车到墨西哥。

They came all the way from Brazil.

他们大老远的从巴西来。

media n.

the mass media

大众媒体

by/through the medium of 通过,经由……

思维拓展 

3.The chemical structure of water makes it an excellent medium for life.

水的化学结构使它成为一种极好的生存载体。

medium n.(赖以生存、活动或传播的)介质;环境、媒介。例如:

Television is an advertisement medium.

电视是广告的媒体。

Air is the medium of sound.

思维拓展 

空气是传播声音的媒介。

in that 因为,在这一点上

now that 既然,由于

not that 并不是说

4.The two hydrogen atoms form a polar molecule, that is, one with a slightly positive end and one with a slightly negative end.

with that 接着就

That’s it. 就这样,完了。

and that 并且

两个氢原子构成了一个极性氢分子,一个略带正极,一个略带负极。

that is=that is to say 也就是,亦即,换句话说。例如:

He will leave Japan next Saturday, that is, June 6.

他将在下星期六,也就是6月6日离开日本。

relative adj.

比较上的,比较的,相对的。例如:

She is living in relative poverty.

她过着较为贫困的生活。

全析提示 

5.Water is a liquid at room temperature and has a relatively high freezing point.

在室温下,水是液体,结冰点相对高。

relatively adv. 相比较而言地。例如:

Relatively speaking, he is getting well.

比较来说,他渐渐地复原了。

It is relatively cold today.

今天相当冷。

dissoluble adj. 可溶解的,可分解的

dissolution n. 分解,分离,溶解

思维拓展 

6.Because water is polar, it can break down, or dissolve, both solids and gases.

由于水具有极性,所以它可以分解或溶解成固体和气体。

dissolve vt. 使溶解,除去,消除。例如:

Hot water dissolves soap well.

香皂易溶于热水。

He dissolved the powder in water.

他把药粉溶解于水中。

They dissolved their marriage.

思维拓展 

他们已解除婚约。

whatever作为连接词,引导让步状语从句,相当于no matter what。例如:Don’t change your plan, whatever happens.

无论怎样,别改变计划。

7.The nutrients in whatever falls into the ocean will

quickly become available to other living creatures.

流入海洋里的任何营养物都会马上被其他生物所利用。

(1)whatever指“任何一切事或物”,在此句中引导名词性从句,意思接近anything that。例如:

Choose whatever you like.

选择你喜欢的任何东西。

思维拓展 

(2)available adj. 可用的,可得到的。例如:

be available for 对于……

avail v. 有助于

availability n. 有效性

Is the library available during the summer vacation?

图书馆在暑假期间有没有开放?

Tickets are available free of charge from the school.

学校有免费票。

8.Even though the pure water is what gives sea water its main properties, the salinity of sea water affects both its weight and freezing point.

尽管纯净水是海水的主要来源,海水的含盐量既影响水的重量,又影响水的结冰点。

pure adj. 纯净的,纯粹的。例如:

The sweater is made of pure wool.

这件毛衣是纯毛制的。

The air in the forest is purer and cleaner than that in the city.

森林的空气比城市里的空气洁净。

friendship 友谊

leadership 领导

professorship

教授的职位

seamanship 航海术

scholarship 奖学金

思维拓展 

9.Density is the relationship between mass and volume and is measured in kilos per cubic meter.

密度是物质的质量跟它的单位体积的比值,以每立方米多少千克来计量。

(1)relationship [C] & [U] 关系;亲属关系。例如:

There is a relationship between the moon and the tides.

月亮和潮水的涨退有关系。

She has a good relationship with her students.

她和学生之间关系良好。

(2)mass [C] & [U] 质量;团,块,大量。例如:

calculating the mass of a planet

计算一颗行星的质量

She has a mass of things to do.

全析提示 

她有一大堆的事情要做。

(3)per prep. 每;每一。例如:

per用于商业及技术用语,日常用语一般用a, an。在per之后接没有冠词的单数名词。

per cent 百分比

a pint of milk per child

每个小孩一品脱牛奶

fifty miles per hour

每小时50英里

floating adj. 不固定的

floating population 流动人口

floating exchange rates 浮动汇率

floating voter 游离选民

思维拓展 

10.If a substance has a higher density, say 5000kg/m3, it will not float on water.

如果一种物质密度较高,比如每立方米5000千克,那它就不会浮在水面。

float vi.& vt.(使)漂浮。例如:

A plastic bag was floating in the water.

一个塑料袋在水中漂浮。

Wood floats on water. 木头会浮在水上。

There wasn’t enough water to float the ship.

水不够深,船浮不起来。

centigrade 略为C. , cent

华氏称为:Fahrenheit

全析提示 

11.Heat capacity is the amount of energy it takes to raise the temperature of a substance one degree centigrade.

热容量是一种使物质升高一摄氏度所需要的能量。

centigrade adj. 摄氏温度计的。例如:

a centigrade thermometer 摄氏温度计

The temperature in this room is twenty degrees centigrade.

这间房间的温度是摄氏20度。

absorb vt. 吸收、理解知识。例如:

It is a lot of information to absorb at once.

思维拓展 

12.Water can absorb and release a lot of heat without big changes in its temperature, thus creating a stable environment.

水在自身温度没有多大变化的情况下可以吸收和释放很多热量,从而起到调节环境的作用。

(1)absorb vt. 吸收。例如:

要一下子消化这些资料,真是很多。

Black cloth absorbs light. 黑色布料吸收光线。

The cream is easily absorbed into the skin.

这种乳霜皮肤容易吸收。

(2)release vt. 释放,放出。例如:

He released the bird from its cage.

他将那只鸟从鸟笼中放了出来。

思维拓展 

(3)stable adj. 稳定的,稳固的。例如:

stable adj. 可靠的,稳重的。例如:

a stable character

稳重的性格,可信赖的人格

stability n. 稳定性

stabilize v. 使安定

This chair is very stable.

这张椅子非常牢固。

The ladder doesn’t seem very stable.

这架梯子好像不太稳。

The patient’s condition is stable.

患者病情稳定。

思维拓展 

13.Most animals and plants are sensitive to large or

sensitively adv. 易感觉地

sensitivity n. 灵敏,敏感性

sensitive plant 含羞草

sudden changes in temperature, so the ocean is a safe and comfortable habitat.

绝大多数动物和植物对气温的突然变化都很敏感,所以海洋是所有生物的一个很安全和舒适的栖息地。

sensitive adj. 敏感的,灵敏的。例如:

She is sensitive to the cold.

她对冷非常敏感。

My sister is sensitive about her thick legs.

我的妹妹对自己的一双粗腿很在意。

at the bottom of 在……底端

bottom up 干杯

from the bottom of the heart 衷心地,发自内心地

go to the bottom of 彻底查明,查明真相

hit bottom 得到结论

bottom out 降到最低点

思维拓展 

14.But, there is life even on the bottom or floor of the deepest oceans.

但是,即便是在海洋的最深处,也有生命存在。

bottom [C] & [U] 底面,物体的最低部位。例如:

The ship sank to the bottom of the sea.

那艘船沉到海底了。

There was some jam left in the bottom of the pot.

罐底还留下一些果酱。

He dived in and hit his head on the bottom.

他跳水时,头撞在了池底。 Post-reading

思维拓展 

add in 包括,算进去

add up 合计

add up to 总计,共达

add that 又说,补写,补充说。例如:

He added that he didn’t

1.Are there any questions you would need to add to “cover” all the information in the text?

你是否还需要一些问题去涵盖课文里的所有信息?

add to 增添,追加,附加。例如:

Will you add more sugar to your coffee?

你的咖啡要多加些糖吗?

Please add my name to the list.

believe it.

他补充说他不相信。

请在名单上加上我的名字。

The suite will add a touch of class to your bedroom.

这套家具会给你的卧室增添一些典雅气质。

思维拓展 

2.What is it good for?

be good at 擅长

be good to 对……好

as good as 和……一样

for good 永久地

good and evil 善恶

它适用于什么?

be good for 适于……;对……有用处。例如:

The cream is good for insect bites.

这药膏对于昆虫蜇伤很有疗效。

He is good for nothing. 他这个人没用处。

a ticket good for two weeks 两周内有效的车票

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