单选题For all its extremes, Venus is a（n） incalculable laboratory for researchers studying the weather and climate of earth.AinvaluableBvaluableCvalueDvalueless
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
参考解析
解析：
词义辨析。incalculable意为“无法计算的，不可估量的”，因此与invaluable（无价的；无法估计的）表达意思相符。valuable贵重的；有价值的。value价值；估价；评价。valueless不足道的，无价值的。
词义辨析。incalculable意为“无法计算的，不可估量的”，因此与invaluable（无价的；无法估计的）表达意思相符。valuable贵重的；有价值的。value价值；估价；评价。valueless不足道的，无价值的。
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