单项选择题

A．Lack of appropriate terms.
B．Lack of scientific methods.
C．Their different personalities.
D．Their reluctance to think in a common sense fashion.
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单项选择题
A．How primitive people used flags.B．What the ancient means of communication was.C．Why the torch towers were built.D．How the Great Wall came into being.
A．How primitive people used flags.
B．What the ancient means of communication was.
C．Why the torch towers were built.
D．How the Great Wall came into being.
单项选择题
A．A two-bedroom apartment.B．A sofa.C．A chair.D．A roommate.
A．A two-bedroom apartment.
B．A sofa.
C．A chair.
D．A roommate.
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