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单选题
The grain output of our country has _____ that before 1949.
A
three times
B
tripled
C
twice
D
third of
参考答案
参考解析
解析：
句意：我国的粮食产量是1949年以前的三倍。triple为动词表示“使，成为三倍”。此处空格处应填谓语动词的形式，因此B为正确答案。three times表示“三倍”。twice表示“两倍”，均不是动词，不能构成句子的谓语部分。third of表达错误。
句意：我国的粮食产量是1949年以前的三倍。triple为动词表示“使，成为三倍”。此处空格处应填谓语动词的形式，因此B为正确答案。three times表示“三倍”。twice表示“两倍”，均不是动词，不能构成句子的谓语部分。third of表达错误。
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Everyone agrees that innovation is the key to solving the many challenges we face as a country from health care to education to the environment, and is fundamental to restoring economic growth and prosperity. But I would put it a slightly different way. We must find a way to rebuild the "innovation infrastructure" in this country.
The problem is not that Americans aren′t as inherently innovative as ever we are. And the level of interest among Americans in the process of innovation--determining the best recipes to make it happen--has been skyrocketing over the past few years. For example, the number of times the word "innovation" appeared in Google news stores has increased by approximately five from Obama′s inauguration to today. Google the term "innovation" and you′ 11 get 342 million hits, approximately half the 676 million hits that "Obama" generates. And according to hash tags org, innovation is trending about the same rate as deficit.
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Americans are ready and willing to embrace the goal of once again leading the world in innovation. This could be the moon shot for the next decade that unifies our country. However, we are at a tremendous disadvantage unless the innovation infrastructure of this country is rebuilt. This requires a new collaboration among government, industry and academia-one that is suited to the challenges and opportunities of the digital age, and that restores the bold risk taking and action orientation of earlier times.
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