Introduction - 3.Quiz time.(4m) Choose the correct
answers to the quiz in Part 1. Then listen and
check your answers.
Answers:
1. Water exists as a solid, a liquid and a gas.
2. When you heat a metal, it expands.
3. Steel is a mixture of iron and other substances.
4. Two-thirds of the earth’s surface is water.
5. The distance of the sun from the earth is
150,500,500 kilometres.
6. The earth is 4.6 billion years old.
7. The earth is forty-nine times larger than the moon.
Introduction – 4.Classification(2m) Put the words
in pairs or groups.
contract air
moon
solid
earth gas
moon solid
liquid
oxygen
expand sun
1
air – gas - oxygen
2
contract - expand
3
earth – sun - moon
4
gas – liquid - solid
Introduction – 5.Classification(2m) Put words in
the right place.
electricity
steel
iron
air
metal
glass
natural
electricity
iron
some metals
air
man-made
steel glass some metals
both
electricity
some metals (alloy for example)
Look at the pictures collected by our classmates.
Do you know the name of these equipment？
test tube
crucible
tongs
beaker & glass rod
balance
Bunsen burner
Since you are interested in doing scientific experiments,
now let’s get to know some vocabulary and knowledge related
to science and experiment.
Potassium
（钾）
Sodium(钠)
Calcium(钙)
Magnesium(镁)
Aluminium
Zinc
（铝）
（锌）
Iron
（铁）
Copper
（铜）
英语中基数词、序数词、
分数、小数和百分数的
读法
1.基数词的读法：
A. 先说“几十”， 再说“几”，中间
用连字符。如：
23— twenty-three
89— eighty-nine
B. 先说“几百”， 再加and,再加末两位
数（或末位数）。如：
223— two hundred and twenty-three
416— four hundred and sixteen
809— eight hundred and nine
C. 1000以上的数先从后向前数，每三位数加
一“,”（千分位）；第一个“,”号前为
thousand; 第二个“,”号前为million; 第三个
“,”号前为billion。如：
1,001— one thousand and one
4,000— four thousand
9,743— nine thousand, seven hundred and
forty-three
174,301— a (one) hundred and seventy-four
thousand, three hundred and one
750,000,000— seven hundred and fifty million
2.序数词的读法
序数词一般以与之相应的基数词加词
尾-th构成，如：tenth（第十），但下
面这些基数词在变序数词时， 有特别
的地方。如：
A. one — first
two — second
three— third
five— fifth
eight — eighth nine— ninth
twelve— twelfth
fraction
We write
We say
1/5
one fifth
1/6
one sixth
1/7
one seventh
4/7
four sevenths
7/10
seven tenths
97/111
ninety-seven one hundred and
elevenths
45/87
forty-five eighty-sevenths
总结: 你能看出他们有什么特点吗？
分子用基数词,分母用序数词;分子大
于1,分母的序数词需要加s。
另外, 还有几个特殊表达的情况:
one half
1/2
50%
1/4
one quarter
1/3
one third
3/4
three quarters
2/3
25%
33.33r % r:recurring
two thirds
A half is the same as 50 percent.
75%
66.66%
百分数：
percentage
5) 百分数的读法
27% — twenty-seven percent
45% — forty-five percent
86% — eighty-six percent
Can you say the following in English
correctly?
1,000
one thousand
2,000
two thousand
12,000
twelve thousand
112,000
one hundred and twelve thousand
796,000 seven hundred and ninety six
thousand
879,457
eight hundred and seventy-nine thousand,
four hundred and fifty-seven
1,000,000
one million
9,000,000
nine million
32,000,000
thirty-two million
212,000,000
two hundred and twelve
million
988,766,688
nine hundred and eighty-eight million,
seven hundred and sixty-six thousand,
six hundred and eighty-eight
987,654,321
nine hundred and eighty-seven
million, six hundred and fifty-four
thousand, three hundred and twentyone
1,000,000,000
one billion
9,000,000,000
nine billion
32,000,000,000
thirty-two billion
564,865,000,000
five hundred, sixty-four billion, eight
hundred, sixty-five million
978,876,675,467
nine hundred and seventy-eight
billion, eight hundred and seventy-
six million, six hundred and seventyfive thousand, four hundred and
sixty-seven
Practice
Now let’s say: 2/5 5/8 9/10 3/8 5/6
two-fifths
five-eighths
nine-tenths three-eighths
five-sixths
Can you say the following in English
correctly?
0.5
point five
0.8
point eight
0.76
point seven six
1.23
one point two three
23.45
point four five
twenty-three point
100.32
point three two
one hundred point
87.675
point six seven five
eighty-seven point
7.564
seven point
point five six four
总结：小数点用point
Read these questions aloud and say
the answers.
1. What is ½ of 6,000,000? three million
2. How much is 35,246,000 plus
12,800,000?
forty-eight million, forty-six thousand
3. What is 25% of 200,000,000?
fifty million
4. How much is 260,408,396 and 5,284,700?
two hundred, sixty-five million, six
hundred, ninety-three thousand, ninetysix
5. What is ¾ of 1,000,500,000?
seven hundred, fifty million, three
hundred, seventy-five thousand
6. What is 10% of 800,000,000?
eighty million
Homework
Finish Exercise 9 on P 93.