世界上陆地和海洋的比例大约是（    ）

用同一只密度计测量酒精和水的密度，密度计在酒精中受到的浮力 ____在水中受到的浮力，在酒精中露出的体积 ____在水中露出的体积．（选填“大于”、“小于”或“等于”）

⑴What are you doing?____              A. She will get a present.

⑵What happened to him?____        B. He was lost.

⑶What will Jenny get?____              C. She must hurry up

⑷What must she do?____                D. I'm reading a story book.