A:so clearly as
B:as clear as
C:more clearly
D:clearer than
①细胞不具有大液泡 ②细胞具有大液泡 ③死细胞;
④活细胞 ⑤细胞液浓度>外界溶液浓度 ⑥细胞液浓度<外界溶液浓度.