Grammar多媒体教案及点评

Period 3 Reading and Vocabulary Teaching Goals: 1. Let Ss master how to read a passage; 2. Let Ss master some words and phrases; 3. Get Ss to talk something about science experiments Teaching procedures: Step 1 Lead-in and Vocabulary 1. Today we are going to talk about science experiments. What do you think of when you see a lab? (Allow them to say out their thoughts even if they don’t know how to say in English.)

balance

alcohol burner

test tube

(Use the pictures to introduce some words to the Ss.) 2. (Group Work) Ask Ss how to do

an experiment? Put the following words in order.

conclusion

aim

result

method Suggested answers: When we do an experiment, we should first of all have an aim. We should use proper methods. We should find out the result and get a conclusion. Step 2 Reading Purpose: To improve Ss’ reading skills. 1. (Individual Work) Fast reading: Read Passage A and choose the best title for it. Suggested answers: The reaction of Metals

2. Careful reading: (Individual Work)

(1) Read the passage again. Answer these questions.

a. Which of the metals in the table reacts the most with oxygen and water?

b. What happens when you heat calcium in oxygen?

c. Which metals react with steam?

d. Does iron have a slow of fast reaction with steam?

e. Does copper react with water? Suggested answers: ①

Potassium, calcium and sodium ②

It burns to form anoxide ③

Magnesium, aluminium and

zine. ④

It has a slow reaction. ⑤

No, it doesn’t.

(Do some explanations about them if necessary)

(2) Read Passage B and fill in the table.

Suggested answers:

Stage A (Starting experiment) Stage B (1 week later) Stage C (Result) Iron in dry air cotton wool nails cotton wool nails Iron does

not rust Iron in air-free water oil layer water nails Iron in ordinary water water nails oil layer water nails Iron does not rust water nails Iron rusts

(3) Read Passage B again. Complete the sentences.

①

In the first part of the experiment, the ____ is dry, not wet.

②

It shows that iron ______________when the air is dry.

③

In the second part of the experiment, you must _____ the water to make sure there is no ____ in it.

④

You add _________ to the water because this keeps ____ out of it.

⑤

It shows that _____ does not rust in water that has no _____ in it. Suggested answers: ①

air ②

does not rust ③. boil, air ④

some oil, air ⑤

nail, air 3. Post reading (Group Work) Ask Ss to watch the experiment carefully. And then try to retell the stages of the experiment.

Report

Aim: _____________________________________________________

_____________________________________________________ Apparatus: _______________________________________________

________________________________________________

Result: ____________________________________________________

____________________________________________________

Conclusion:_________________________________________________ Method: ___________________________________________________

_______________________________________________ Suggested answers:

Report

Aim: To find out if iron rusts (a) in pure water; (b) in air-free water;

(c) in dry air Apparatus: 3 clean iron nails; test tubes; wood, oil; test tubes holder Result: The nails do not rust in the second and third tubes Conclusion: Iron doesn't rust in air-free water or dry air but in pure water.

Method: First, put some iron nails at the bottom of three test tubes.

Second, half-fill the first two test tubes with water.

Third, add some oil to the water into the second test tube.

Fourth, push a wood down the third tube.

Fifth, leave the tubes for one week.

Step 3 Language study Purpose: To let the Ss understand the passage well. 1. (Pair Work) Vocabulary: Ask the Ss to finish Activity 6 on page 46.

(Call back the answers after several minutes.) Reference:

React: have effect on (of one substance applied to another)

Steam: gas from boiling water

Oil: liquid which does not mix with water, obtained from animals, plants or found in rock

underground

Boil: (of water or other liquid) reach the temperature at which change to gas occurs

Scientific: of, for, connected with, used in science

Experiment: test carried out carefully in order to study what happens and gain new

knowledge

Float: be held up in air, gas or on the surface of liquid; move with liquid or air

Form: give shape or form to; make, produce

Dissolve: (of a liquid) soak into a solid so that the solid itself becomes liquid 2. Group work.

Ss are divided into groups of four. Each group is supposed to read through each part, and then discuss them.

(1) When we use metals, it is important to know how they react with different substances, for example, water and oxygen.使用金属时，要了解金属和不同的物质如何发生反应，例如，水和氧气。这一点很重要。

react vi. & vt.

①

作出反应，反应。后接介词to。

Eg How did she react to the news?

②

影响，起作用。后接介词on / upon。

Eg The two react upon each other.

③

抗拒，反抗。后接介词against。

Eg Children tend to react against their parents by going against their wishes. ④

起反作用，反过来起作用。常接介词on / upon。

Eg Unkindness often reacts on the unkind person.

⑤

[化]起化学作用，[物]反应。后接介词with / on。

Eg a. How do acids react on metals?

b. An acid can react with a base to form a salt.

(2) To find out if iron rusts in dry air.弄清楚铁在干燥的空气中是否生锈。

find out 指经过探听、询问、调查之后，才发现某事或事情的真相。

Eg ①

He has found out the man who stole the watch.

②

Will you try to find out when the trains leave?

[辨析] ◆

find有偶然发现某物的意思

Eg On her way home, Tim found a wallet lying on the ground.

◆

discover表示发现存在的但以前不为人知的事物，也可表示发现已为人知的事物的新的性质或用途，这种发现可能是有意的，也可能是无意的。

Eg Madame Curie discovered the element of radium.

(3) Put these words in the correct order to describe the stages of a scientific experiment.按正确的顺序排列下面词汇，描述一项科学实验的各个阶段。

put … in the correct order 按正确的顺序排列。in order按顺序。

Eg ①

The reaction of metals with these substances can be put in order.

②

Put everything in the room in order. (4) Now, what’s the aim of this experiment, Zhou Kai? 这次实验的目的是什么，周凯？

aim ①

vt. & vi.

把……瞄准；把……对准掷向；意欲，旨在。

Eg a. This anti-smoking campaign is mainly aimed at young teenagers.

b. My brother aims to be a novelist.

②

n. 目标，目的。常接介词of。

Eg It is now our aim to set up a factory.

5. No, we need rather more than that – about two and a half grams. 我们所需要的要大大超过那些——大约两克半。

rather是程度副词，修饰比较级more。例如：

Eg

①

For the old, living in the country is rather more comfortable than in city.

②

This computer is rather more expensive than that one.

※

注意：与rather近义的quite, fairly, very, too不能修饰比较级。可修饰比较级的词有：

◆

a bit, a little, rather, much, far, by far, many, a lot, lots, a great deal, any, still, even等。

◆

还可以用表示倍数的词或度量名词作修饰语。

Eg ①

Tom is far cleverer than any other boys in the class.

②

Sam is twice older than I.

③

Learning Greek is much harder than learning English.

6. I never used to enjoy science, but last year I changed schools, and the science teachers at my new school are excellent. 我过去从来没有喜欢过理科，但去年我换了学校，新学校的理科老师们非常出色。

used to do sth. 表示过去常常做某事，强调现在不再这样做。其否定式是used not …,可缩写为usedn’t / usen’t, 口语中可用didn’t use…。例如：

Eg ①

I used to live there when I was a child.

②

Used you to like opera? / Did you like opera?

③There used to be a church here, usedn’t there?

[联想] ◆

be used to do sth. 被用来做某事

Eg Wood can be used to make paper. 木材可以用来造纸。

◆

be / get used to sth. / doing sth. 习惯于做某事

Eg He was used to sleeping with the windows open. 他习惯敞着窗子睡觉。

Step 4 Homework 1.

Do Exercises 6, 7, 8 on page 92-93. 2.

Prepare for the Listening class.