问题 选择题

轻轨电车是近年来城市发展的一种无污染的新兴交通工具,当轻轨电车开动时,轻轨电车与架空电线的接触点由于高速摩擦会产生高温,因此接触点上的材料应该具有耐高温,不易氧化,能导电的性质,你认为接触点上的材料应选用(  )

A.金刚石

B.铝

C.石墨

D.铜

答案

由题意可知:接触点上的材料应该具有耐高温、不易氧化、能导电的性质.而具备以上性质的物质只能为碳的单质----石墨.而金刚石太昂贵;铝和铜为金属,虽然具有能导电的性质,但是不耐高温、易氧化.

故选C.

填空题

Marks & Spencer has a very good reputation for job security and looking after its staff, with things like good perks, (1) , that sort of thing. Do those things actually (2)
I think it is, it is very important. When people have been working (3) , and they may have been in from seven or eight o’clock in the morning, they can come off the sales floor and can go to (4) and obviously they can have tea, coffee, or (5) , and can then buy at very reduced rates (6) , if they want one, or a roll and cheese, in a pleasant environment, (7) , food of the highest quality, there’re areas where they can (8) , or play pool or something, yeah, that is very important because they need (9) . At busy times, they need to get away from it, they need to be able to relax. In terms of all the (10) we’ve got, that is very important, when people know that they will be having medicals, and (11) is another thing, obviously there’s (12) that they will buy which they will be able to buy (13) . For Christmas bonus, we give all our general staff (14) which is guaranteed, and the (15) of that, actually, at the busiest time of the year when they’re (16) and working hard, is fantastic and to see their faces as you (17) with 10% of their salary in it. I believe the environment that you work in, (18) that you work with, the way you are treated, (19) , and the fact that your views are listened to, and you feel you are consulted, that makes people (20) and makes them get up and come to work in the morning.

单项选择题