Post Reading

Lead-in

Passage A

Passage B

Important sentences

BBB. aim

D. method

A. result

C. conclusionDD AA CC

Put these words in the correct

order to describe the stages of a

scientific experiment.

Read the passage and choose

the best title for it.

The Different Uses of Metals

The Reaction of Metals

The Reaction of Metals with Oxygen

Metals Heated in oxygenReaction with water or

steam

Potassium

Burn to form an oxide

Reacting with cold water

Sodium

Calcium

Magnesium

Reacting with steamAluminium

Zinc

Iron Reacts slowly Partial reaction

Copper Partial reaction No reaction

The Reaction of Metals

Read the passage again. Answer

these questions.

1. Which of the metals in the table reacts

the most with oxygen and water?

Potassium, calcium and sodium.

2. What happens when you heat calcium

in oxygen?

It burns to form an oxide.

3. Which metals react with steam?

Magnesium, aluminium and zinc.

4. Does iron have a slow or fast

reaction with steam?

It has a slow reaction.

5. Does copper react with water?

No, it doesn’t.

What experiment does Passage B show us in?

A. How does the nail rust?

B. How does iron react with air and with water?

C. How do we do an experiment about the reaction of iron?

Read the passage and fill in the table.

Iron in dry air

Iron in air-free water

Iron in ordinary

water

Stage A(starting experiment)

cotton wool water water

Stage B(1 week later)

Stage C (Result)

nailswater

Iron does not rust

Iron does not rust

Iron rusts

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.

air

does not rust

boil

air

Read the passage again. Complete

the sentences.

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.

some oil

air

nail

air

1. When we use metals, it is important to

know how they react with different

substances, for example, water and

oxygen.

= When we use metals, we should know

how metals react with different

substances, for example, water and

oxygen, which is very important.

本句是一个复合句，其中 when 引导时间状语从句；在主句中， it 为形式主语，真正的主语是动词不定式短语 to know

... substances ，其中 how ... substances

为 how 引导的宾语从句，作 know 的宾语， for example 引出同位语，表示举例。

2. Here is a table with the metals that

react most at the top, and the metals

that react least at the bottom.

= A table is here. At the top of the table

we can see the metals that react most

and at the bottom of the table we can

see metals that react least.

本句使用了倒装语序。句子的主语是 a

table ，后面的 with ... bottom 作定语修饰 a table ；两个 that 都引导定语从句修饰 the metals 。句意 : 这里有一个表格，反应最强烈的金属在最上面 , 反应最弱的在最下面。