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14.The wide spread of super hybrid rice around the world ______ the lives of millions and millions of people suffering from hunger to a great level.(  )
A.has improvedB.is improving
C.improvedD.has been improving

分析 超级杂交水稻在世界范围内的广泛传播,使亿万遭受着饥饿的人们的生活提高到了很高的水平.

解答 答案:A
分析句意可知,此处表示过去的动作或状态对现在产生的影响或造成的后果,即:亿万遭受着饥饿的人们已经逐步摆脱饥饿的困扰,所以这里应使用现在完成时;故选A.

点评 本题考查了现在完成时强调"影响性"的用法;做本题时,需要了解现在完成时除了强调动作的持续性以外,它还强调过去的动作对现在产生的影响以及造成的结果;例如:I have already seen the film.我已经看过这部电影了.(对现在的影响是:我知道电影的内容);I have lost my key.我把钥匙弄丢了.(造成的结果是:我进不了门了.)

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