A:酚酞试液
B:氯化钡溶液
C:石蕊试液
D:碳酸钠溶液
植物体能够由小长大,主要依靠细胞的____使细胞数目增多,其次是依靠细胞的____使体积增大.
—I think teenagers should be allowed to make their own decisions when they have problems at school.
—_______. They're not calm enough, after all.