单项选择题

A．New foods to try when traveling.
B．Making reservations for the best travel.
C．Avoiding gaining weight while traveling.
D．Adjusting to time changes when traveling.
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单项选择题
A．She had moved out of the old address.B．She ignored it.C．The library didn’t try to inform her about it.D．The landlord refused to give the books back to her.
A．She had moved out of the old address.
B．She ignored it.
C．The library didn’t try to inform her about it.
D．The landlord refused to give the books back to her.
填空题
Urban ozone is primarily caused by __________________, which are produced by fossil fuels.
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