—What do you think of these two books?

—________ of them are interesting. And I’ve read them several times.

A．Both

B．Neither

C．None

D．Either

纤毛虫遇到刺激后产生的分泌物来自于表膜下的（）

A.刺丝囊

B.刺细胞

C.刺丝泡

D.刺丝