如图是两幅大河河口示意图，图中小岛因泥沙淤积而扩展，按一般规律，最终将与河流的哪一岸相连？（　　）

已知△ABC中，∠C=90°，AC=6，BC=8， 则cosB的值是

① Can I help you? ____     A. He is ill.

② What can Sarah do?  ____     B. I went there by plane.

③ What's the matter with Sam?  ____     C. She can play the piano.

④ How did you go to Beijing last winter holiday? ____     D. Red.

⑤ What's your favourite colour?____     E. Yes, I'd like a shirt.

哥白尼的“日心说”并非科学，但他的巨大进步意义在于(    )