For all its extremes, Venus is a(n) incalculable laboratory for researchers stud

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问题 For all its extremes, Venus is a(n) incalculable laboratory for researchers studying the weather and climate of earth.

选项 A、invaluable
B、valuable
C、value
D、valueless

答案 A

解析词义辨析incalculable不可计算的，无数的，难以衡量的；而A．invaluable无价的，价值无法衡量的；B．valuable贵重的，有价值的，颇有价值的；C．value价值，估价，评价，价格；D．valueless不足道的；因此A为答案。

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