大学英语阅读教程Reading 4(9)

1

Main Idea:

People move from one city or country to another,the spread of diseases may result Causes Effects

A germ is completely new to a region people who already live there have no natural protection against it

People move can spread the diseases

When they go back they may carry the diseases with them 2

Main Idea:

Changes in heating system of buildings can also lead to disease

Causes Effects

Shortage

3

Main Idea:pollution of the oceans can also results in the spread of disease.

Causes Effects

Chemicals from fertilizers and human waste pollute ocean

Pollutants increased growth of tiny plants called

Algae provide a home for cholera,a deadly algae disease

Exercise 14

1

Main Idea:pilots and flight attendants have long know that they become especially forgetful when they fly often with little rest

Causes Effects

Have long flights may may with jet lag

People with jet lag some brain cells were damaged

Have damaged brain cells their brain had become smaller

2

Main Idea:ignorance about the African continent has led to some enormous errors in mapmaking

Causes

The mapmaker draw a long line of mountains,as he called kong mountain Effects

The people seemed to be an important feature of the continental

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