Teenagers should learn to protect _ form all kinds of danger.A.them B.they C.their D.themselve麻烦选择一个,

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• Teenagers should learn to protect _ form all kinds of danger.A.them B.they C.their D.themselve
• Teenagers should learn to protect _ form all kinds of danger.A.them B.they C.their D.themselve麻烦选择一个,
• 英语翻译不太准确哦。说的是国家石油安全。语言环境：The simple answer is that the vulnerability premium is lower than the cost of becoming self-sufficient,but that response merely begs the question.Why is the vulnerability premium lower?It is lower for three primary reasons:(1) embargoes are not certain events-they may never occur; (2) domestic steps can be taken to reduce vulnerability of the remaining imports; and (3) accelerating domestic production would incur a user cost b
• we all should learn to protect our planet,because all of us are()of ita.step d.part c.future d.beginning无解释不采纳