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在反向市场上，由于对现货及近期月份合约需求迫切，购买者愿意承担全部持仓费来持有现货。（）

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如果期货市场上没有期货投机者，只有套期保值者参与期货交易，那么只有在买入套期保值者和卖出套期保值者的交易数量完全相符时，交易才能实现，风险才能得以转移。（）

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Long bus rides are like television shows. They have a beginning, a middle, and an end—with commercials thrown in every three or four minutes. The commercials are unavoidable. They happen whether you want them or not. Every couple of minutes a billboard glides by outside the bus win-dow. "Buy Super Clean Toothpaste. "" Drink Root Beer. " "Fill up with Pacific Gas. " Only if you sleep, which is equal to turning the television set off, are you spared the unending cry of "You Need It! Buy It Now.! "
The beginning of the ride is comfortable and somewhat exciting, even if you' ve traveled that way before. Usually some things have changed--new houses, new buildings, sometimes even a new road. (76) The bus driver has a style. of driving and it' s fun to try to figure it out the first hour or so. If the driver is particularly reckless or daring, the ride can be as thrilling as a suspense story.
Will the driver pass the truck in time？ Will the driver move into the right or the left-hand lane？ Af-ter a while, of course, the excitement dies down. Sleeping for a while helps pass the middle hours of the ride. Food always makes bus rides more interesting. But you' ve got to be careful of what kind of food you eat. Too much salty food can make you very thirsty between stops.
The end of the ride is somewhat like the beginning. You know it will soon be over and there ' s a kind of expectation and excitement in that. The seat, of course, has become harder as the hours have passed. (77)By now you' ve sat with your legs crossed, with your hands in your lap, with your hands on the armrests--even with your hands crossed behind your head. The end comes just at the right time. There are just no more ways to sit.
According to the passage， what do the passengers usually see when they are on a long bus trip？查看材料

A. Buses on the road
B. Films on television
C. Advertisements on the board
D. Gas stations

分光光度法常以标准曲线定量，凡符合朗伯-比尔定律的物质，其标准曲线一定是一条通过原点的直线。

在¹H NMR(H核磁共振波谱)法中的n+1规律，就是当一种H核的邻近(不超过三个键)有几个等价的H核存在时，则此种H核的共振吸收峰分裂为n+1重峰。