题目内容
19.听下面一段独白,回答第18至第20小题.18.What does the speaker mainly talk about?
A.An experiment.
B.A workbook.
C.Equipment.
19.Who is the speaker?
A.A teacher.
B.A librarian.
C.A tour guide.
20.How are the activities different from experiments?
A.The activities take less time.
B.No equipment is needed in activities.
C.Fewer instructions are given for activities.
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