概要：6.What are some examples of species in the ocean?T:Well done.Who can tell me the general idea of the text?S4:The passage mainly tells us it is water that makes the ocean so important to all the living things in the world.T:Good work.Next,let’s read the passage carefully to get more information about water.While you are reading,try to finish the chart in Post-reading on Page 21 and find out the answers to the questions on the blackboard.(Teacher gives students enough time to r
高二 Unit13 教案（Period 2）,标签：高二英语选修7教案,高二英语下册教案,http://www.67jx.com6.What are some examples of species in the ocean?
T:Well done.Who can tell me the general idea of the text?
S4:The passage mainly tells us it is water that makes the ocean so important to all the living things in the world.
T:Good work.Next,let’s read the passage carefully to get more information about water.While you are reading,try to finish the chart in Post-reading on Page 21 and find out the answers to the questions on the blackboard.
(Teacher gives students enough time to read the text and collects their information for the chart.)
Suggested answers:
Property
What is it?
What is it good for?
Chemical structure
Every water molecule is made up of two hydrogen atoms and one oxygen atom.
It is good for the living things in the ocean to absorb the nutrients easily.
Density
The density of pure water is 1 000 kg/m3,meaning that one cubic metre of water weighs one thousand kilogram.
It is good for marine organisms to take advantage of the density of water.
Heat capacity
Heat capacity is the amount of energy it takes to raise the temperature of a substance one degree centigrade.
It is good for the earth to keep the temperature steady.
T:Very good.What about the questions on the blackboard?
S5:I think I can answer the first one.The answer is that the properties of water are chemical structure,salinity density,heat capacity and ocean motion.
S6:In my opinion,the answer to the fourth question is that the ocean can be compared to a great place to live in.
T:Do you agree with them?
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