单项选择题

Students or teachers can participate in excursions to lovely beaches around the island at regular

A．gaps
B．rate
C．length
D．intervals
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单项选择题
No one could come up with an easy solution to the government's predicament—labor ______ which is caused by the wars.
A．decline
B．vacancy
C．rarity
D．shortage
单项选择题
Just as a book is often judged ______ by the quality and appearance of its cover, a person is judged immediately by his appearance.
A．previously
B．uniquely
C．outwardly .
D．initially
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