Science is still ______ of the causes of many kinds of cancer.
A.ignorant
B.unconscious
C.conscious
D.informed
Science is still ______ of the causes of many kinds of cancer.
A.ignorant
B.unconscious
C.conscious
D.informed
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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