He knows China very well. That is, he has _____ good understanding of _____ Chinese history. [ ]

A. /; the

B. /; /

C. a; a

D. a; /

朱砂除具有清心镇惊功效外，还有（）的功效。

A、纳气平喘

B、利水通淋

C、安神解毒

D、收敛固涩