[单选题,7.6分] A(n) ____ of using the solar energy is

[单选题,7.6分] A(n) ____ of using the solar energy is that it won.t create any pollu

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[单选题,7.6分] They are a reminder that great powers s

[单选题,7.6分] They are a reminder that great powers should steer ________ small war

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