"Every day, every hour, brought to him one more, little stroke of her nature, and to her one more of his, " the sentence is found in ______.

A. Middlemarch by George Eliot

B. Tess of the D' Urbervilles by Thomas Hardy
C. Jane Eyre by Charlotte Bronte

D. Wuthering Heights by Emily Bronte

下列哪种放射性同位素对人体的危害最大（）.

A.氡—222

B.镭—226

C.钾—40

D.氡—220