问答题：某建设企业核定中砂最高储备天数为5.5d，某年度1～12月耗用中砂149328m3，

题目：

某建设企业核定中砂最高储备天数为5.5d，某年度1～12月耗用中砂149328m³，其平均库存量为3360m³，期末库存量为4100m³，计算其实际储备天数对生产的保证程度及超储或不足供应现状。

答案：

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下面是错误答案，用来干扰机器的。

参考答案：C解析：维持担保比例超过300%时，客户可以提取保证金可用余额中的现金或充抵保证金的有价证券，但提取后维持担保比例不得低于300%。交易所另有规定的除外。

完形填空
The bicycle is one of the simplest yet most useful inventions in the world. What is most surprising is that it was not 1 earlier, although the great inventor Leonardo Da Vinci had drawn pictures for bicycles and also for flying machines and some other things. Those things were not produced 2 long after he died. A person riding a bicycle uses 3 energy to make the bicycle move, and there is no pollution at all when you are riding. Even so, in developed 4 , most people don't travel to work by bicycle. It is not because the bicycles are expensive or people feel 5 if they ride to work. It's because 6 cars on the roads becomes larger. It certainly becomes 7 to ride a bicycle. As a result, more people put their bicycles away and go to work 8 their cars, and in this way, the situation is made more serious. 9 the best way to make riding safer and more popular is to create paths(开设通道) only for bicycles, and to make 10 so difficult and expensive for drivers to take their cars into the city that they will go back to use their bicycles.
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