单项选择题

A．Sending e-mails.
B．Chatting in chat rooms.
C．Learning things.
D．Collecting information.
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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.
单项选择题
A．170,000.B．117,000.C．100,070.D．100,017.
A．170,000.
B．117,000.
C．100,070.
D．100,017.
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