单项选择题

Which of the following statements is NOT true

A．This is an international conference.
B．This is an academic Conference.
C．This is a formal occasion.
D．The language used in this conversation is informal.
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单项选择题
Why will battery buses cost less than conventional buses in the long run
A．They will spread the capital cost over a long period.
B．They will be stronger and last longer.
C．They will use less fuel and cost less to maintain.
D．They will be charged at night when electricity costs less.
填空题
otherwise
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