It is ____ that text messaging while dri

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问题 It is ____ that text messaging while driving is dangerous.（　　）A． significantB． obviousC． necessaryD． sufficient

选项 A． significant
B． obvious
C． necessary
D． sufficient

答案 B

解析句意：开车发短信明显是很危险的。significant重要的；obvious明显的；necessary必要的；sufficient充足的。

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