Book 5 Unit 1 Great Scientists预习学案

一．目标聚焦

1、了解著名医生约翰·斯诺、钱学森、哥白尼等科学家。

2、学会使用表示描述人物的句型

3. 学习过去分词作定语和表语的结构

二．走进课文

1. Read the passage and number these events in the order that they happened.

---John Snow began to test two theories.

---An outbreak of cholera hit London in 1854.

--- John Snow marked the deaths on a map.

---He announced that the water carried the disease.

---John Snow investigated two streets where the outbreak was very severe.

---King Cholera was defeated.

---He found that most of the deaths were near a water pump.

---He had the handle removed from the water pump.

2. Read the passage and answer these questions.

　John Snow believed Idea 2 was right. How did he finally prove it?

　____________________________________________________________________________

　Do you think John Snow would have solved this problem without map? give a reason.

　____________________________________________________________________________

　Cholera was a 19th century disease. what disease do you think is similar to cholera today? why?

　____________________________________________________________________________

三．句式点击

1. With this extra evidence John Snow was able to announce with certainty that polluted water carried the virus.

with this extra evidence 有了这个额外的证据；with certainty 肯定地，有把握地

在句中作状语，相当于副词.

that 引导宾语从句

polluted 过去分词作定语

2. So many thousands of terrified people died every time there was an outbreak.

terrified 过去分词作定语

every time 短语充当连词作用，还有 the moment/ minute /second; the first / second ... last time; immediately/instantly/ directly

eg: The first time I went abroad I could hardly understand what the foreigners said.

The moment I saw him, I knew what had happened.

3. It seemed that the water was to blame.

be ﹢动词不定式，可以表示该做或不该做的事