单选题：Accordingtothepassage,whatisthesafetyconcernaboutdeliverydro

题目分类：英语六级
题目类型：单选题
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题目内容：

Accordingtothepassage,whatisthesafetyconcernaboutdeliverydrones? A．Thedronesmaybeusedforsurveillance.
B．Thedronesmaygetoutofcontrol.
C．Thedronesmayburstintoflames.
D．Thedronesmaybeusedasmilitaryaircraft.

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Whatmakeshumanitiesstudentsoutstandingisthattheytrytobeself-

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WhileAmericansocietystressedthatpeopleshouldearnourownliving

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Questions are based on the following passage．It all started

Questions are based on the following passage．It all started in 2009, with a se

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