Although Venus is the nearest planet of the Earth, little is known about it beca

游客2025-04-14 4

问题 Although Venus is the nearest planet of the Earth, little is known about it because it is______ covered by thick clouds.

选项 A、closely
B、curiously
C、regularly
D、constantly

答案 D

解析副词词义辨析。closely“接近地”；curiously“好奇地”；regularly“有规律地，整齐地”；constantly“经常地；坚持不懈地”。根据句意“Venus常年被厚厚的云覆盖”可知答案为D。

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