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外研2003课标版《Listening and vocabulary》PPT课件优质课下载
iron nails
oil
cotton wool
test tubes
test tube holder
Watch carefully!
Reading: A Simple Scientific Experiment
1
2
To find out if iron rusts
(a) in dry air (b) in air-free water (c) in ordinary water
Complete the chart
What’s the aim of the experiment?
Method
in dry air
1
2
in air-free water
3
in ordinary water
put, at the bottom
of, push down,
leave
half-fill, boil, put,
add...to, leave