B3U4学案

单元课题:B3U4 Astronomy:the science of the stars
(HOW LIFE BEGAN ON THE EARTH) 编制: Gao Yu Wang Qian Wang Li Zhang Chun 审阅:Wang Xin 使用日期：第6周第1课时
【课前预习案】
【Learning Aims学习目标】
1.To master new words and expressions from the context.
2.To improve the reading abilities: scanning, skimming, careful reading.
I.【夯基固本】夯实词汇，学习之本
A 重点掌握（达到默写程度）
1.系统；体系n._______
2.理论n._____________
3.猛烈的adj._________
n.___________
4.不像prep.__________
5.有害的adj._________ 无害的adj.__________
伤害n.v.____________
6.存在vi._____________
n._____________
7.因此adv.____________
8.谜;难题n.___________
令人迷惑的adj._______
感到迷惑的adj._______
9.温和的adj.____________
adv.____________
10.拉vi.牵引力n.________
B 识记词汇
1.astronomy__________
2.religion____________
3.globe______________
4.carbon dioxide_______
5.atmosphere___________
6.fundamental__________
7.chain________________
8.multiply_____________
9.oxygen_____________
10.climate____________
11.crash______________
12.float______________
C 重点短语（达到默写程度）
1.及时；终于__________________
2.下蛋________________________
3.产生；分娩__________________
4.轮到某人____________________
5.阻止；制止__________________
6.感到振奋________________________
7.既然____________________________
8.突发；爆发______________________
9.密切注意；当心__________________
D 短语汇总（方法指导：在课本P25-P29用荧光笔标出，课前达到默写程度）
1.
2. cool down冷却下来
3.be fundamental to对...是基本的
4.fill...with...用...填充...
5.all sorts of各种各样的
6.as well as和
8.as a result of由于
9.depend on依赖；取决于
10.block out挡住(光线)
II. Analyze (分析) the difficult sentences.
（方法指导：运用语法基础知识，分析下列句子结构，翻译句子，提高语言应用能力。

）
I.【夯基固本】见课件
II. Fill in the blanks according to the text.注意规范答题，注意所给词汇的形式变化！
Many years after the big bang, the earth1.___________(explode)loudly with fire and rock. It became so violent 2.________later it produced many gases. Most 3.___________(important), water also appeared on the earth, which allowed the earth to dissolve 4.____________(harm) gases. Then life began to develop. Small plants filled the oceans with oxygen, which encouraged the 5.____________(develop) of early fish. Small land animals appeared and produced young generally by 6.__________(lay) eggs. After that some huge animals 7._________(call) dinosaurs developed. Finally, human, in 8._________(they) turn, became the most important animals on 9.__________ planet. However, they are putting too much carbon dioxide, which prevents heat 10.____________ escaping from the earth into space. III. 根据老师的指导，预习语言点。