一个点光源垂直入射到被照面上所形成之照度，与光源距被照面距离的几次方成正比( )
题型：单项选择题
问题：
一个点光源垂直入射到被照面上所形成之照度，与光源距被照面距离的几次方成正比( )
A．一次方
B．二次方
C．三次方
D．四次方
题型：单项选择题
第二节信息匹配（共5小题；每小题2分，满分10分）
阅读下列应用文及相关信息，并按照要求匹配信息。
首先请阅读下列交通卡的信息：
请阅读下列购买者的信息，然后匹配购买者拟购买的交通卡：56. Margaret - is a 65-year-old retired woman who lives in Glasgow, Scotland and visits her sister in London four times a year. She usually takes the long-distance train on these journeys and the normal return train fare is E50.
57. Bill - is a student living in London and needs to catch the bus to and from university every weekday. The normal cost of the fare is ;E3 each way.
58. Robert - will visit London for 1 day with his family (wife and 2 daughters) and plans to use the public transport system to see as much of the city as possible. According to his plan they will be catching at least 5 buses or trains that day. Average cost of each fare is # 3 per person.
59. Jill - is a 40-year-old mother who lives in West London and has to travel to the city centre for work each day. To get there she needs to catch a bus to the train station then board the train to work. Average cost of each ticket is #3.60. Albert - is a salesman who mainly visits his customers in the city but must also travel to other parts of the country at least twice each month. He prefers to travel by train.
