正八面体由______个面，______条棱，______个顶点组成．_爱下问搜题

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问题填空题

正八面体由______个面，______条棱，______个顶点组成．

答案

正八面体有8个面，每个面都是全等的正三角形，有6个顶点，12条棱．

故答案为：8，12，6．

完形填空

A young man was getting ready to graduate from college. For many months he had 16   a beautiful sports car in a dealer’s showroom, and   17   his father could well 18  it, he told him that was all he wanted.
On the morning of his graduation day his father called him into his own study and told him how 19   he was to have such a fine son. He handed his son a beautiful gift box. 20 but slightly disappointed, the young man 21  the box and found a lovely book. 22 , he raised his voice at his father and said, “ 23 all your money you give me a book?” and rushed out of the house 24  the book in the study.
He did not contact（联系）his father for a whole year 25   one day he saw in the street an old man who looked like his father. He  26  he had to go back home and see his father.
When he arrived at his father’s house, he was told that his father had been in hospital for a week. The moment he was about to 27 the hospital, he saw on the desk the 28  new book ,just as he had left it one 29 ago. He opened it and began to 30 the pages. Suddenly, a car key 31 from an envelope taped behind the book .It had a tag（标签）with dealer’s name, the 32 dealer who had the sports car he had 33  .On the tag was the 34 of his graduation, and the 35 PAID IN FULL.

B．comfortable

B．information

问答题简答题

室内环境检测报告一般由开发商提供吗？