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【单选题】
The largest set of wings on any bird, more than three meters across, is found on the albatross. They are so heavy that it is difficult for the albatross to flap them in order to take off and fly. Not all large birds can fly. Albatross often nest on steep cliffs so that they can simply fall off into the air. Once they are airborne, they soar gracefully.A.
The largest set of wings on any bird, more than three meters across, is found on the albatross.
B.
They are so heavy that it is difficult for the albatross to flap them in order to take off and fly.
C.
Not all large birds can fly.
D.
Albatross often nest on steep cliffs so that they can simply fall off into the air.
E.
Once they are airborne, they soar gracefully.
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