题目内容

It is believed that            part of animals can’t stay alive in water at 1,500 meters below ____
sea level.
A．不填；不填B．a; aC．the; theD．不填; the
A
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A．不填；不填B．the； theC．the；不填D．不填； the
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A．the; aB．a; 不填C．the; theD．a; the
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