Question

The radiation of uranium was then regarded as_____secret of_____nature.

A.a;the                 B.a;a             C.the;the        D.a;/

Answer 1

D

解析:

本题考查冠词的基本用法，单数名词表示泛指，用不定冠词。nature 为不可数名词，不用冠词。