Module 5 A lesson in a lab
module 5 a lesson in a lab
period 1
teaching aims:
1. let the students know some words related to experiments, the lab and something like that
2. review the usage of numbers/ fractions/ percentages
3. know sth about degrees of comparison.
teaching steps:
i. all of us have learned physics, biology and chemistry in middle school. now let’s have a test to see how much you know.
deal with activity 1 on page 41. choose the correct answers to the quiz.
now play the tape for the students to listen and check their answers.
answers:
1 a 2 a 3 a 4 a 5 b 6 b 7 b
ii. first read the words and then ask the ss to translate them into chinese. at last put them in pairs or groups.
answers:
air-gas-oxygen contract-expand earth- sun- moon
gas-liquid-solid
iii.. answer the questions.
answers:
1) electricity, iron, some metals and air are natural
2) steel, some metals and glass are man-made
3) electricity and some metals can be man-made and occur naturally
iv. turn to page 42.
activity 1 read the numbers. pay attention to the position of the word “ and”.
v. fractions.
基數詞+序數詞，當分子大于1時，分母要加s
作主語時，謂語動詞要根據of 后面的名詞決定。
answers:
two-fifths five-eighths nine-tenths three-eighths five-sixths
vi. percentages
基數詞+ percent/ per cent 注意：percent 永遠單數形式
作主語時，謂語動詞要根據of 后面的名詞決定。
vii. degrees of comparison 1 & 2
英語倍數表達法
用英語表達"a 是 b 的 n 倍長（寬，高，大，重等）"，"a 比 b 長（寬，高，大，重等）n 倍" 或"a 的長度（寬度，高度，大
小，重量等）是 b 的 n 倍"，可用下列幾種句型。
1."a + be + 倍數 + as + 計量形容詞原級 + as + b".
this tree is three times as tall as that one. 這棵樹是那棵樹的三倍高。
his father is twice as old as he. 他父親的年紀有他兩倍大。
2."a + be + 倍數 + 計量形容詞比較級 + than + b "
the yangtze river is almost twice longer than the pearl river.
長江差不多比珠江長兩倍。
the dictionary is exactly five times more expensive than that one.
這本字典比那本恰好貴5倍。
3."a + be + 倍數 + the + 計量名詞 + of + b "
the newly broadened square id four times the size of the previous one.
新擴建的廣場是未擴建時的四倍大。
4."the + 計量名詞 + of + a + be + 倍數 + that + of + b "
the size of the newly broadened square is four times that of the previous one.