Some of the larger birds can remain stationary in the air for several minutes.A:

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问题 Some of the larger birds can remain stationary in the air for several minutes.

选项 A:silent
B:seated
C:true
D:motionless

答案D

解析本句意思:一些大型鸟类能够在空中保持不动数分钟。stationary意思是“不动的,静止的”,与motionless(不动的,静止的)意思相同。silent寂静的,沉默的;seated就座的,根深蒂固的,固定的;true真正的,真实的。
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