Although appearing less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year-they are often green and striped, or have plenty of bumps and bruises-heirlooms are more flavorful and thus in increasing demand.
(A) Although appearing less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year
(B) Although heirloom tomatoes, grown from seeds saved during the previous year, appear less appetizing than most of their round and red supermarket cousins
(C) Although they appear less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year
(D) Grown from seeds saved during the previous year, heirloom tomatoes appear less appetizing than most of their round and red supermarket cousins
(E) Heirloom tomatoes, grown from seeds saved during the previous year, although they appear less appetizing than most of their round and red supermarket cousins
题目分析：前半句和后半句在意思上有转折关系，必须加although，否则前后这个转折没办法体现出来。剩下三个选项注意划线外的那个they，后半句已经有主语了，可是A和C在后半句还用heirloom tomatoes做主语，那划线外那个they就多余了，不行，只有B
