单项选择题

During daylight hours, birds______.

A．fly aimlessly
B．rely on landmarks
C．use sun for guidance
D．are more likely to get lost
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单项选择题
Which of the following statements is correct
A．He often has an ordinary package vacation.
B．He is a typical comfort traveler.
C．He is somewhere between a comfort traveler and an adventurous traveler.
D．He likes to take an adventur
单项选择题
The writer criticizes visual entertainment because______.
A．it does not require men’s creative powers
B．it cannot improve our intelligence and skill
C．it demands too much of our imagination
D．it leads men to slow degeneration in health
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