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As a senior high student, you should 　　your energy on how to master the skills of learning.
A．impressB．spendC．concentrateD．use
C

試題分析：詞的用法。Concentrate ...on ,集中...于spend time/money on sth/in doing sth 花時(shí)間/金錢做某事. Impress 給...印象句意：作為一個(gè)高中生，你應(yīng)該把你的精力集中在怎樣掌握學(xué)習(xí)的技能上。故選C
點(diǎn)評(píng)：注意與介詞的搭配。補(bǔ)充：fix/focus/concentrate....on, attract/catch one’s attention to
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