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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How do we know a student is ready to start the next phase of his course
单项选择题
A．She was a woman.B．She wrote too many letters.C．She couldn’t graduate from a medical school.D．She couldn’t establish her hospital.
A．She was a woman.
B．She wrote too many letters.
C．She couldn’t graduate from a medical school.
D．She couldn’t establish her hospital.
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