单项选择题

属于不溶性骨架材料的是（）

A.蜡类
B.乙基纤维素
C.羟丙基甲基纤维素
D.环糊精
E.淀粉

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单项选择题
M: Let me carry that for you. It looks like you’ve bought a lot of gifts for your family!W: Some, but not that many. The gifts are in that small suitcase. You know I take a lot of luggage with me when I go away.Q: Where is the conversation most probably taking place?（）

A．At the airport.
B．In an office.
C．In a shop.
D．In a car.
单项选择题
早在公元前3000年至公元前2700年,国王每两年就派人清查全国的人口、土地等财富,以确定租税数额。
A.古埃及
B．古印度
C．古中国
D．古希腊
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