[单选题]The moon was obscured by thick clouds.

正确答案 ：B

prevented

解析：句意为：厚厚的云朵遮住了月亮。prevent意为“预防、阻止”，hold意为“持有、保留”，darken意为“使模糊、变黑”，blacken意为“使变黑、诽谤”。obscure意为“遮掩，使变暗”。和B项同义，故选B项。

[单选题]Only a small minority of the mentally ill are liable to harm themselves or others,

正确答案 ：C

likely

[单选题] 

正确答案 ：A

examined

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