生日蛋糕是当代少年儿童生日时爱吃的食物，生日蛋糕中的奶油含有对人体有害的反式脂肪酸，其化学式为C₁₈H₃₄O₂．下列说法正确的是（   ）

体积相同的实心铜球和铁球浸没在水中（ρ_铜＞ρ_铁），铜球受到的浮力____ 铁球受到的浮力；质量相同的实心铜球和铁球浸没在水中，铜球的体积____ 铁球的体积，铜球受到的浮力____铁球受到的浮力．（均选填“小于”、“等于”或“大于”）

A. Look at the duck. It is short and fat.  

B. The pig has a fat body and big ears. 

C. Look! They're Lucy and Lily. T Lucy is from Australia. Lily is from Canada.

D. Mr White is my teacher. He's from the USA.

E. This is Amy, She's my sister. She's a pupil. 

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⑶ ____

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⑸ ____

夜晚，当你向一盏路灯走近到离开路灯的过程中，你的影子长度是          (     )