Science is still ______ of the causes of many kinds of cancer.

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Science is still ______ of the causes of many kinds of cancer.

A.ignorant

B.unconscious

C.conscious

D.informed

参考答案:

A解析:ignorant可以指“无学识的,愚昧的”,还指“不知道的”;unconscious意为“失去知觉的,不省人事的;无意识的”;conscious意为“有知觉的,意识到的”;informed意为“获悉,告知”。

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