单项选择题

The traveler wants to have a trip to______.

A．a country in Asia
B．a country in Africa
C．a city in US
D．either Mexico or Brazil
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单项选择题
The reason why birds don’t get lost on long flights
A．has been known to scientists for years
B．has only recently been discovered
C．is known by everyone
D．will probably remain a mystery
单项选择题
The conversation is about______.
A．the work of the future
B．the workplace of the future
C．the food of the future
D．the entertainment of the future
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