单项选择题

A．Free.
B．$30.
C．$60.
D．$120.
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单项选择题
A．$1.53.B．$15.3.C．$5.3.D．$3.5.
A．$1.53.
B．$15.3.
C．$5.3.
D．$3.5.
单项选择题
A．It doesn’’t need to be refueled.B．It will use solar energy as fuel.C．It will be driven by electrical power.D．It will be more suitable for long distance travel.
A．It doesn’’t need to be refueled.
B．It will use solar energy as fuel.
C．It will be driven by electrical power.
D．It will be more suitable for long distance travel.
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