4. -Are those your books?
-____. They are hers.
A:Yes, they are
B:Yes, those are
C:No, they aren’t
D:No, those aren’t
请你参与某历史兴趣小组“学习借鉴国外先进经验"的研习活动。
关于光合作用和呼吸作用的叙述,正确的是( )