下列动物中体内有脊柱的是（　　） ①家鸽②藏羚羊③蚯蚓④鲫鱼⑤蟾蜍⑥蝗虫．

A．①②④⑤

B．①②⑤⑥

C．①②③⑤

D．①②④⑥

_______ many children like KFC, I think they'd better try not to eat it too often.[ ]

A. Because

B. When

C. Although

D. If