—How long have you _____ the dictionary?
—For two years. [ ]
A. buy
B. bought
C. had
答案:C
能发光的物体称为______.
糖的有氧氧化第一阶段的反应是在哪里进行的()
A.胞浆
B.肝脏
C.线粒体
D.肾脏
E.乳腺