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中国从短缺经济迅速过渡到有效需求相对不足的原因是什么采取什么战略能保持经济高速、稳定和持续发展请用相关的经济学理论加以解释。
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阅读下面短文，回答下列五道题。在地球之外，究竟有没有外星人两位美国学者撰文说，他们花了5年时间，在北半球天空捕捉到了37个可能是来自地球外文明的讯号。这两位学者是利用直径为26米的射电望远镜，来寻找由浩瀚宇宙深处发出的未知讯号的。他们以波长21厘米和10.5厘米的电波对北半球天空的全部区域分别进行了三次和两次调查。许多从事探索地球外文明的科学家认为，波长为21厘米的电波在宇宙空间中极为普通，如果地球外文明要向其他星体发出讯号，就很有可能会使用这个波长。在探测时，他们试图寻找从极狭窄区域中释放出的强大电波。每次探测的时间约需 200～400天，所以获得的观察资料十分庞大。经过筛选，才获得了这37个讯号，其中有5个讯号特别强烈。这些讯号大多数是沿着银河系分布的，在银河系内有着大量的恒星，是智慧生命可能存在的地方。然而，至今还未发现具有已接收讯号特征的电波源，且在这些电波的方向上，也没有特异的星体存在。这37个讯号果真是由外星人发出的吗科学家认为，如果在这37个讯号当中包括地球外文明的讯息，那么这就可能是由地球外文明发出的最强或最近的讯号。 根据原文所给的信息，以下各项正确的是（）。
A. by keeping its original shape and color B. in the life of the cut flower C. tO produce carbon dioxide D. for as long as possible E. by controlling temperature F. to replace the water and solution every day Another important way to prolong the life of cut flowers is ______.
下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。 A Pay Rise or Not "Unless I get a rise, I’ll have a talk with the boss, Henry Manley. "George Strong said to himself. George liked his job and he liked the town he lived in, but his wife kept telling him that his pay was not enough to meet the needs of the family. That was why he was thinking of taking a job in Birmingham, a nearby city about 50 miles away. He had been offered a job in a factory there, and the pay was far better. George lived in Wyeford, a medium-sized town. He really liked the place and didn’t like the idea of moving somewhere else, but if he took the job in Birmingham, he would have to move his family there. Henry Manley was the manager of a small company manufacturing electric motors. The company was in deep trouble because, among other reasons, the Japanese were selling such things at very low prices. As a result, Manley had to cut his own prices and profits as well. Otherwise he would not get any orders at all. Even then, orders were still not coming in fast enough, so that there was no money for raises (加工资) for his workers. Somehow, he had to struggle along and keep his best workers as well. He sighed. Just then the phone rang. His secretary told him that George Strong wanted to see him as soon as possible. Manley sighed again. He could guess what it was about. George Strong was a very young engineer. The company had no future unless it could attract and keep men like him. Manley rubbed his forehead (前额), his problems seemed endless. Henry Manley’s company was in deep trouble.
甲公司与乙公司草签了一份电冰箱购销合同。合同约定：甲公司向乙公司购买电冰箱100台，每台单价3000元，总货款为30万元。为了保证甲公司履行合同，甲公司预付款10万元。如果甲公司退货，违约金比例为总货款的30%，如果电冰箱价格上涨，乙公司有单方面解除合同的权利。 如果双方协商将预付款改为定金，则定金数额( )。
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