单项选择题

A．Many species have developed a habit of migration.
B．Many species have become less sensitive to climate.
C．Many new species have come into existence.
D．Many species have moved further north.
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单项选择题
Which of the following is mentioned as one of the causes of bad breath
A．Tooth trouble.
B．Too much exercise.
C．Sulfur-rich food.
D．Mental strain.
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