step 1 greetings
greet the whole class as usual.
step 2 revision
show the metals learned in the last period to the class and ask them to name them in english.
step 3 presentation
read the passage to find the answers to the questions.
1. what’s the aim of the experiment?
2. what equipment do we need in order to do the experiment?
3. how long does it take to see whethe资源难易程度:★★★★★★★★★★★★★★★
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