—The patient looks much better.________ is it that has made him ________ he is today?

—Perhaps the special medicine and his family's patient care.

A．What；that

B．That；that

C．What；what

D．What；which

下列有关叶绿体及光合作用的叙述，正确的是（）

A.离体的叶绿体基质中添加ATP、NADPH和CO₂后，可完成暗反应

B.植物生长过程中，叶绿体内各种色素的比例保持不变

C.与夏季相比，植物在冬季光合速率低的主要原因是光照时间缩短

D.破坏叶绿体外膜后，O₂不能产生