单项选择题

A．Why species don’t avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren’t extinct.
D．How many species aren’t extinct.
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单项选择题
A．She lost a finger.B．She became a surgical nurse.C．Someone hit her in the nose.D．She had an operation on her nose.
A．She lost a finger.
B．She became a surgical nurse.
C．Someone hit her in the nose.
D．She had an operation on her nose.
单项选择题
A．Working too long.B．Accumulated stress.C．Bad sleeping habits.D．Anti-social lifestyles.
A．Working too long.
B．Accumulated stress.
C．Bad sleeping habits.
D．Anti-social lifestyles.
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