Choosing an Animal Model Pathogen may not affect animal at all -OR￾may give different symptoms Given disease may have a number of animal models, none of which fully satisfies characteristics of disease

要求： 1、 表达出空间感 2、 表达出色调感 3、 表达出虚实感 4、 构图美观

When the receiver detects errors in a packet, how does it let the transmitter know to re-send the corresponding packet? Systems which automatically request the retransmission of missing

Introduction The Specific Factors Model International Trade in the Specific Factors Model Income Distribution and the Gains from Trade The Political Economy of Trade: A Preliminary View Summary

Unit Four Section A: Five Famous Symbols of American Culture warm- up activities: 1. What are the symbols of American Culture that you have heard about? 2. What can you imagine to be the reasons why the Statue of liberty was built?

1. Historical background: The Victorian age can be roughly divided into three periods: (1) 1832-1848: a time of social unrest; (2) 1848-1870: a period of economic prosperity and religious controversy; (3) 1870-1901: a period of decay of Victorian values

Summary: Absorption Knowledge: Three main parts: Part 1: how to achieve an absorption process? Part 2 : how to determine the basic parameters of a packed column? Part 3: how to enhance an absorption process?

Unit six Section A How to Prepare for Earthquakes Warm-up questions 1. Have you ever been in an earthquake? 2. What do you think you would do first if the room started to shake? 3. How should we prepare for earthquakes?

Water vapor in the air The volume of Water vapor is variable, depending on temperature, precipitation, rate of evaporation and other factors at a particular location The percentage of water vapor ranges from 0.1- 5%. Generally it is 1-3%(the 3rd most abundant constituents in the air)

I. Preparation Warm-up Activities 1. Pair Work: Talk with your neighbor about someone you love most. Words you may refer to: considerate patient a great helper generous housework hard-working point out one's mistakes a good cook encouraging tender honest gentle respectable easy to get along with a good listener kind caring