动词 rise 与动词 raise 有何区别?
rise(rose, risen)是个不及物动词，例句见rise/arise。raise(raised, raised)则是个及物动词，如raise a flag (a hat, a glass), raise prices (the wages, the salary, the temperature, the voice):
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The weight is too heavy; I can't raise it. (Palmer) 这件东西太重,我拿不起来。
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Have you raised the wages? 你涨工资了吗?
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That discussion raised my interest. (FWF) 那场讨论引起了我的兴趣。
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The mother raised her child from the ground. 母亲把孩子从地上抱起来。改正下面句子里的错误：
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Many firms try to survive by rising productivity.
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She rose her hand to ask a question.
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The class raised when the teacher entered.
请做下面的英语试题：
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When I asked George what he thought of the situation he didn't speak, just raised his shoulders to show disdain. (A) shuffled (B) shrouded (C) shrugged (D) shucked.
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This island has little vegetation; it scarcely raises above the surrounding sea. (TOEFL)
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When the other guests and I had rose to leave the table, the host pushed back his chair and stood up instantly to accompany us to the living room. (TOEFL)
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I perceive the fish to rise out of the water. (TOEFL)
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For a good two hours the boat swung along in a light breeze until the fisherman refused to go further for fear of a risen storm. (EPT)