(   ) 9. If we human beings continue to waste and destroy natural resources without using        energy，such as the energy from the sun，wind and water，our Earth will be done for.

 A. alternative    B. primitive    C. conventional    D. systematic

9. A考查形容詞的詞義。alternative兩者擇一的，供選擇的；primitive原始的，簡陋的；conventional 傳統(tǒng)的;systematic有系統(tǒng)的，分類的。句意：如果人類繼續(xù)浪費(fèi)和破壞自然資源，不使用如太陽能，風(fēng)力和水這樣的替代能源，我們的地球就完了。

題目來源：高考丟分題英語 > Unit 5 Meeting your ancestors

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