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【单选题】
The reason why all the solar energy falling on the earth can’t be utilized is that ______.
only a very small part is available the sun is too distant from the earth
it takes thousands of years for this energy to be stored up in coal and oil
our scientific knowledge is not sufficient
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根据网考网考试中心的答案统计,该试题:
7%的考友选择了A选项1%的考友选择了B选项7%的考友选择了C选项85%的考友选择了D选项