单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．Employ them as lab assistants.
B．Teach classes at their high school.
C．Help them with their studies.
D．Pay them for participating in the study.
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单项选择题
A．Toys have changed so much over the centuries.B．The technique in toy-making has remained unchanged.C．The technique in toy-making has changed a lot.D．Toys have remained basically the same over the centuries.
A．Toys have changed so much over the centuries.
B．The technique in toy-making has remained unchanged.
C．The technique in toy-making has changed a lot.
D．Toys have remained basically the same over the centuries.
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