单项选择题

The author's purpose in writing this text is ______.

A．to investigate why people choose to travel
B．to celebrate the grand American tradition of travel
C．to encourage more Americans to travel
D．to describe the travel market in the United States

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单项选择题The phrase higher costs to the wallet (Lines 4-5, Para.6) most probably means ______.

A．increased prices
B．more expensive wallets
C．higher taxes
D．higher levels of anxiety

单项选择题Car-rental companies expect more rentals this summer, despite ______.

A．the poor economy
B．increased air travel
C．increased ownership of private cars
D．higher gasoline prices