文档介绍：UNIT 8
Nature
PART 1 Listening and Speaking
Listening and Speaking
PART 2 Reading
Text A Raindrop, Snowflake
Text B What Can You Do About Global Warming
Text C TV Forecast Plays the Hero
PART 3 Grammar
状语从句(Adverbial Clauses)
PART 4 Translation
复习(Revision)
PART 5 Writing
E-mails
PART 6 Enjoy Yourself
The Day After Tomorrow
Objectives
▲talk about weather in simple English.
▲use sentence structures in the two texts and summarize the main idea of the passages.
▲use adverbial clauses in given contexts.
▲write an e-mail message in simple English.
Objectives
After studying this unit, the students are expected to be able to
Water cycle
Meteorologists
Human behavior’s effect on climate change
Background knowledge
Water cycle
The earth has a limited amount of water. That water keeps going around and around and around and around and (well, you get the idea) in what we call the “Water Cycle”. This cycle is made up of a few main parts:
◇evaporation (and transpiration)
◇condensation
◇precipitation
◇Collection
Background knowledge
Evaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam. The water vapor or steam leaves the river, lake or ocean and goes into the air.
Condensation—Water vapor in the air gets cold and changes back into liquid, forming clouds. This iscalled condensation.
Precipitation—occurs when so much water has condensed that the air cannot hold it anymore. The clouds get heavy and water falls back to the earth in the form of rain, hail, sleet or snow.
Collection—When water falls back to earth as precipitation, it may fall back in the oceans, lakes or rivers or it may end up on land. When it ends up on land, it will either soak into the earth and e part of the “ground water” that plants and animals use to drink or it may run over the soil and collect in the oceans, lakes or rivers where the cycle starts
Background knowledge
Meteorologists
A meteorologist is an individual with specializ