Language points導學案
第二課時 language pointsteaching aims:
master the words and useful expressions in the text.
using the language points.
課前預習
1. match the words and the explanations:
in time 下蛋
lay eggs 產(chǎn)生；分娩
give birth to 及時；終于
in one’s turn 阻止；制止
prevent … from 輪到某人；接著
2. read the explanation and speak out the word it explains.
causing harm adj.
sudden and powerful; using force to hurt or attack adj.
to be, or to be real; to live, or to live in difficult conditions
the number 1 000 000 000
the mixture of gases around the earth; a feeling that a place has of being pleasant
and interesting or exciting n.
課堂學習
task 1: understanding.
a.match the phrases underlined with their correct meaning.
1.they were in time to produce carbon, nitrogen, water vapour and other gases.
2.they multiplied and filled the oceans and seas with oxygen.
3.carbon dioxide prevents heat from escaping from the earth.
4.it was not immediately obvious that water was to be fundamental to the development of life.
a. increase in number b. important
c. stop/keep…from d. after a long period of time
b.try to find a sentence that can be replaced by the following one:
now it’s their turn to be the most important animals on the planet
c.translate the following sentence.
1.it was not immediately obvious that water was to be fundamental to the development of life.
2. that made it possible for life to begin to develop.
task 2 learning the languages points:
1.it exploded loudly with fire and rock,which were in time to produce the water vapor,carbon dioxide,oxygen,nitrogen and other gases,...