单项选择题

It is advisable to see a dentist regularly.

A. frightening
B. terrible
C. wise
D. beneficial
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If you memorize a poem, you can say it without looking at a book.
A. appreciate
B. enjoy
C. analyze
D. remember
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We have taken effective measures to preserve our natural resources.
A. protect
B. reserve
C. consume
D. save
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