题目内容
Safety comes first. Which is right?
① When you are alone at home, open the door as soon as someone knocks at the door.
②Pay attention to the gas, water and electricity.
③Walk across the street when the traffic lights turn green.
④Don’t mention our private matters when we meet a stranger.
⑤Always meet the persons who you know on the Internet.
A.②③④ B.①②⑤ C.①③⑤
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