题目内容
标准仓单签发完毕后，即可用于履行交易所期货合约的实物交割。()
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在一个平稳的市场状况中，期货投资基金的基金经理们也可以通过投资组合获得获利机会。()
当市场是熊市时，一般来说，较近月份的合约价格的下降幅度往往要大于较远月份的合约价格的下降幅度。()
经中国期货业协会同意，结算所可以运用其他会员或客户除了风险基金之外的保证存款，去填补某一会员无力偿付的债项。()
听力原文： I wonder how many of you would went to work in a tall building such as the Empire State Building if you had to climb 102 flights of stairs to reach the top. Not many, I imagine. If it were not for the invention of elevators, or lifts, tall buildings would be unusable.
The first lift was just a box suspended on a rope. Using a series of pulleys, a group of oxen ox strong men would pull the rope end lift the box to a higher point. Lifts were used only for heavy materials, not passengers. Even in the nineteenth century, when steam power was used to operate the lifts, people didn't ride them. They didn't trust the rope that held the box.
In 1853, Elisha G. Otis invented the first safe lift. He showed his invention in New York at the Crystal Palace Exhibition. At the exhibition, Otis was pulled up in an open box that was attached to two guide mils. When he was lifted far above the spectators, he gave the order to cat the rope. To the amazement of the crowd, the lift did not fall straight downward to the floor. Instead, it was held fast to the guide rails by a certain device. He had built powerful metal clamps on the carriage as a safety measure. The demonstration worked, and people have been riding as passengers in elevators ever since.
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