单项选择题

A．One.
B．Two.
C．Three.
D．Four.
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单项选择题
A．Because they have new features and functions.B．Because they are more sophisticated than other models.C．Because they have new accessories attached.D．Because it wants to accumulate funds for future research.
A．Because they have new features and functions.
B．Because they are more sophisticated than other models.
C．Because they have new accessories attached.
D．Because it wants to accumulate funds for future research.
单项选择题
A．One week.B．Two weeks.C．Three weeks.D．Twenty days.
A．One week.
B．Two weeks.
C．Three weeks.
D．Twenty days.
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