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 超級雜交水稻在世界范圍內(nèi)的廣泛傳播，使億萬遭受著饑餓的人們的生活提高到了很高的水平．

解答 答案：A
分析句意可知，此處表示過去的動作或狀態(tài)對現(xiàn)在產(chǎn)生的影響或造成的后果，即：億萬遭受著饑餓的人們已經(jīng)逐步擺脫饑餓的困擾，所以這里應(yīng)使用現(xiàn)在完成時；故選A．

點(diǎn)評 本題考查了現(xiàn)在完成時強(qiáng)調(diào)"影響性"的用法；做本題時，需要了解現(xiàn)在完成時除了強(qiáng)調(diào)動作的持續(xù)性以外，它還強(qiáng)調(diào)過去的動作對現(xiàn)在產(chǎn)生的影響以及造成的結(jié)果；例如：I have already seen the film．我已經(jīng)看過這部電影了．（對現(xiàn)在的影響是：我知道電影的內(nèi)容）；I have lost my key．我把鑰匙弄丟了．（造成的結(jié)果是：我進(jìn)不了門了．）

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