转：课时讲练通课件Module 5 A Lesson in a Lab Period 1

4. This makes sure there is no air in the water. make sure(that) 后面跟了一个宾语从句, 从句通常采用 分析: (1)______________ 一般现在 时态。 _________ 确保…… , 务必使…… 。 (2)make sure (that). . . 意思是“ ____________________” 确保水中没有空气 。 句意: 这样做是为了_________________
想, 考虑; 把……当成
把……关在外面 使……有条理 弄清楚, 弄明白
in _____ order 5. put. . . __ out 6. find ___
different from 7. be ________ as 8. the same __ to 9. react __ as 10. exist __
Module 5
Period 1
A Lesson in a Lab
Introduction & Reading and Vocabulary(1)
Ⅰ. 根据音标、词性和汉语写出单词 1. 2. 3. liquid (n. )液体 ______ expand vi. )膨胀 _______( contract (vi. )收缩 ________
与……不同 和……一样 与……发生反应
以……存在
Stok at the following pictures and speak out their English names.
balance
test tube
Bunsen bumer
flask
Discussion: 1. What substances do you know? Can you speak them in English? Oxygen, potassium, sodium, calcium, magnesium, aluminium. _____________________________________________________
5. According to Passage B, we know that the “air-free water” probably
means .
A. air with a lot of water B. air without water C. water with plenty of air D. water without air
air is dry.
In the second part of the experiment, boil the water for three minutes to make sure there is no air in the water. You add some oil to keeps air out of it. It also shows that iron does the water because this 7. _____ without air in it. 9. ________, However the nails rust in the not rust in water 8. _______ experiment tube with ordinary water in the third part of the 10. __________. That is how iron reacts with air and with water.
Step 2
Fast Reading
Think it over and summarize the general idea of the text. the reaction of metals Passage B Passage A mainly talks about ___________________; how iron reacts with air and with water shows us __________________________________.
It begins to form an oxide. _______________________
3. Does iron have a slow or fast reaction with steam? It has a slow reaction. ___________________
Ⅲ. Read Passage B and place the following sentences in correct order. 1. Put two or three clean nails in the water. 2. Leave the tube for one week.
3. Which is NOT the equipment that is needed in the experiment of
“Iron in dry air”? A. Cotton wool. C. Iron nails. B. Oil. D. Test tube holder.
4. Which metal doesn’t react with water? A. Sodium. C. Copper. B. Iron. D. Potassium.
B. iron; zinc D. iron; copper
A. steel; copper C. steel; iron
2. According to the table, which metal is the most suitable to make our daily kitchenware? A. Zinc. B. Iron. C. Copper. D. Magnesium.
describe(v. )描述 → description(n. )描述
educate(v. )教育 → education(n. )教育
Ⅲ. 补全下列短语 to . . 1. add. . . __. of 2. two-thirds __ of 3. think __ out __ of 4. keep. . . ___ 往……加入…… 三分之二的……
2. What should you pay attention to when you are carrying out an
experiment in a lab?
Carrying out an experiment in a lab is very dangerous. You must ________________________________________________________ be careful and do the experiment under your teacher’s guidance. ________________________________________________________
句意: 这里是一张金属反应表, 列于顶部的金属反应最剧烈, 底部的则 最缓慢。
3. To find out if iron rusts in water that has no air in it. 分析: 本句有两个从句, 一是find out后面if引导的宾语从句, 另一个 that 引导的定语从句, 修饰_____ water。 是____ 目的是弄清铁在没有空气的水中是否会生锈。 句意: _________________________________________
how 引导的宾语从句。 (2)主句中包含一个____
句意: 当我们使用金属时, 了解金属与不同的物质如何发生反应, 例如水和氧气, 这一点很重要。
2. Here is a table with the metals that react most at the top, and the metals that react least at the bottom. 分析:
9.
10.
Ⅱ. 根据词性和汉语写出单词, 并注意拓展词汇 mixture (n. )混合物→mix(vt. )混合 1. _______ electricity (n. )电 →electrical( adj. )与电有关的; 用电的 2. _________ react vi. )(化学)反应→reaction(n. )反应 3. _____( conclusion n. )结论→conclude(v. )推断, 决定 4. __________(
Step 4
Retelling
Fill in the blanks with proper words according to Passages A and B. Different metals have different uses. When we use metals, it is with different substances. important to know how they react 1. ____ reaction of metals with these substances can be 3. ___ put in order. The 2. ________ From the table, we can find potassium reacts the most with steam or
Ⅱ. Read Passage A carefully and answer the following 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?
4.
5.
substance (n. )物质 _________ stage n. )阶段; 时期 _____(
aim n. )目标; 目的 ____(
6.
7.
8.
boil vt. )煮; 煮沸 ____( ordinary adj. )普通的; 平常的 ________(
form vi. )形成 _____( balance n. )天平 _______(
Step 3
Careful Reading
I. Read the text carefully and choose the best answers. 1. According to Passage A, we know that is often used in cars,
and
is often used in electrical equipment.
3. Half-fill a test tube with water.
4. Add some oil to the water. 5. Boil the water for three minutes.
Ⅳ. Sentence explanation. 1. When we use metals, it is important to know how they react with different substances, for example, water and oxygen. when 引导一个时间状语从句, 主句 分析: (1)这是一个主从复合句, _____ it 作形式主语, 真正的主语是to know how. . . oxygen. 。 中__
copper doesn’t react with steam or water. water while 4. ______
rusts in dry air, in air-free water So in order to find out if iron 5. _____ ordinary water, we will have a simple scientific experiment. and in 6. ________ The first part of the experiment shows that iron doesn’t rust when the
equipment n. )设备; 装备→equip(vt. )装备; 配备 5. __________(
词 汇 微 空 间
v. +ion→n. act(v. )行动 → action(n. )行动
express(v. )表达 → expression(n. )表达
correct(v. )改正; 纠正→ correction(n. )改正; 纠正