【单选题】
For all its extremes, Venus is a (n) incalculable laboratory for researchers studying the weather and climate of earth.
A.invaluable
B.valuable
C.value
D.valueless
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根据网考网移动考试中心的统计,该试题:
75%的考友选择了A选项
3%的考友选择了B选项
9%的考友选择了C选项
13%的考友选择了D选项