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蓝牙系统结构的基本特征主要表现在( )、交换模式、( )、抗干扰性能、鉴权与加密、话音编码和软件结构等方面。
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People are often killed while they are crossing the road. (1) of these people are old people and children. Old people are often killed because they usually can’t see (2) hear very well. Children are killed because they are (3) . They forget (4) (5) they cross the road. A moving car, truck or bus cannot (6) quickly. If a car is going very fast, it will travel (7) before it stops. People don’t always understand this. (8) a car is traveling, the longer it (9) to stop. It is very hard for a person to know how fast a car is traveling. The only safe way to cross the road is to look (10) . The right way to cross the road is to walk quickly. It’s not safe to run.
Using fingers people were able to count. With the______of fingers people were able to count.
People do not know for sure when numbers came into use. It is not______for sure when numbers came into use.
What will be broadcast on television on October 10
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