单项选择题

A．Two.
B．Twenty-six.
C．Twenty-eight.
D．Thirty.
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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.
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.
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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