单项选择题

A．expense
B．restriction
C．allocation
D．availability
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单项选择题
A．immuneB．resistantC．sensitiveD．subject
A．immune
B．resistant
C．sensitive
D．subject
单项选择题
Why do tourists come to Alaska
A．To enjoy its freezing weather.
B．To study its importance in war.
C．To study its volcanoes.
D．To enjoy its beauty of nature.
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