单项选择题

A. He can’t get a room at the hotel.
B. He didn’t get the type of room he wanted.
C. He expected the room to be more expensive.
D. He thought he had already made a reservation.
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单项选择题
Through imaging technology and many studies, what factors do we learn that affect the brain development of the teen years
A. Psychological and physical factors.
B. Academic and scientific factors.
C. Sleeping and dieting factors.
D. Environmental and genetic factors.
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