单项选择题

A．To escape from their enemies.
B．To catch more food.
C．To use their developing flippers.
D．To swim.
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单项选择题
Those who even fail to complete their high school studies________.
A．are unlikely to find stable employment until the age of 25
B．usually attend vocational schools to get the required skills
C．cannot find any jobs at all until the age of 25
D．usually find jobs in the service industry
单项选择题
A．They change color every 50 minutes.B．They change color more quickly.C．They change color more slowly.D．They change color on the same schedule.
A．They change color every 50 minutes.
B．They change color more quickly.
C．They change color more slowly.
D．They change color on the same schedule.
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