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问题 填空题

小明同学利用量筒、水和天平测量一块矿石的密度，测的矿石的体积为20cm3，用用天平测量矿石的质量如图所示，此矿石的质量是______g，矿石的密度是_____g/cm3．

答案

81.4；4.07

选择题

—Nice to see you. I ________ you for a long time.

—I ________ in Beijing. I've just got back. [ ]

A. hadn't seen; was

B. haven't seen; shall be

C. haven't seen; was

D. didn't see; have been

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单项选择题

下列各项中哪一个不是社区功能（）

A.整合功能

B.保障功能

C.价值引导功能

D.生物功能
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