长50厘米，宽40厘米的长方形，面积是20平方分米。

(2010·金华十校)M、N是曲线y＝πsinx与曲线y＝πcosx的两个不同的交点，则|MN|的最小值为(　　)

2011年，国家博物馆把国宝“司母戊鼎”更名为“后母戊鼎”。观察下图，该国宝是（  ）

请根据老师与同学们的对话，为衣物找到主人。
A: Is this your cap?
B: No, it's Mary's.
A: Is this your skirt, May?
B: No, it isn't. It's Lily's.
A: Is this your skirt, Lily?
C: Yes, it is.
A: Are these your gloves?
C: No, they aren't. They are Tom's.
A: Are these your shorts, Li Hai?
D: Yes, they are.
A: Whose scarf is this?
D: It's May's.
⑴Mary  ____                A.
⑵Lily  ____                 B.
⑶Tom  ____              C.
⑷Li Hai  ____               D.
⑸May  ____                E.

张银的妈妈体重60千克，爸爸体重72千克．