单项选择题

A．Three weeks.
B．Three months.
C．Five weeks.
D．Five months.
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单项选择题
A．Sending e-mails.B．Chatting in chat rooms.C．Learning things.D．Collecting information.
A．Sending e-mails.
B．Chatting in chat rooms.
C．Learning things.
D．Collecting information.
单项选择题
A．To explain why things happen.B．To explain how things happen.C．To describe self-evident principles.D．To support Aristotelian science.
A．To explain why things happen.
B．To explain how things happen.
C．To describe self-evident principles.
D．To support Aristotelian science.
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