1. The president of a country and 4 other dignitaries are scheduled to sit in a row on the 5 chairs represnted above. if the president must sit in the center chair. how many different seating arrangements are possible for the 5 people?
A.4 B.5 C.20 D.24 E.120
chair 的位置就如上面企鹅一样排列，这道题就详解~~~谢谢。
2. On a certain scale of intensity, each increment of 10 in magnitude represents a tenfold increase in intensity. On this scale, an intensity corresponding to a magnitude of 165 is how many times an intensity corresponding to a magnitude of 125?
A.40 B.100 C.400 D.1000 E.10000
这道题是一点都不明白。。。。求翻译和详解
3.in 1982 and 1983, company B`s operating expenses were $12.0 million and $ 14.0 million, respectively, and its revenues were $15.6 million and $18.8 million, respectively. what was the percent increase in company B`s profit from 1982 to 1983?
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发表于 2011-7-13 10:05:40
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