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Some of the larger birds can remain stationary in the air for several minutes.
A:silent
B:seated
C:true
D:motionless
B:seated
C:true
D:motionless
参考答案
参考解析
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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