5．They don't know theimportance （important） of saving energy．

分析 他們不知道節(jié)約能源的重要性．

解答 答案：importance 考查單詞填空．根據(jù)題干：the后面要用名詞，important是形容詞，名詞是importance

點(diǎn)評(píng) 解答此題的關(guān)鍵是根據(jù)語境推測要填內(nèi)容表達(dá)的含義，然后能理解各選項(xiàng)內(nèi)容，有時(shí)可能沒有必要細(xì)細(xì)區(qū)分每個(gè)單詞的含義，僅根據(jù)句子語氣就可以判斷出正確答案．

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