Not only _____ polluted, but _____ crowded. [ ]

A. was the city; were the streets 　

B. the city was; the streets were 　

C. was the city; the streets were 　

D. the city was; were the streets

图是某二倍体动物的几个细胞分裂示意图，据图所做的判断正确的是（）

①以上各细胞可能取自同一器官，在发生时间上存在乙→甲→丙的顺序

②甲、乙、丙三个细胞中都含有同源染色体

③乙细胞中含有4个染色体组

④丙细胞是次级精母细胞或极体，正常情况下其分裂产生的子细胞基因型相同

A.②④

B.②③

C.①③

D.①②