单项选择题

A．When he was having dinner.
B．When he was at the police station,
C．When he was taking a bus back home.
D．When he was walking down the street.
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单项选择题
A．The man lost his new camera at the airport.B．The man left his new camera in his friend’s car.C．The man enjoyed using his new camera on his trip.D．The woman lost her new camera on her way to the airport.
A．The man lost his new camera at the airport.
B．The man left his new camera in his friend’s car.
C．The man enjoyed using his new camera on his trip.
D．The woman lost her new camera on her way to the airport.
单项选择题
A．To create artificial bone tissue.B．To learn how to prevent a bone disease.C．To find out how specialized bone cells have evolved.D．To understand differences between bone tissue and other tissue.
A．To create artificial bone tissue.
B．To learn how to prevent a bone disease.
C．To find out how specialized bone cells have evolved.
D．To understand differences between bone tissue and other tissue.
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