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写文章是一件难事。我们在写文章的时候，常常会遇到写不下去的情形。写不下去，有时是因为我们觉得表达还不够妥阽，用什么词都表达不了心中熊熊的烈火，或悲悲的切意；有时是因为我们觉得思想还不够成熟，比较杂乱，比较暖昧，比较粗糙，下不了手；有时是因为我们觉得学识还不够渊博，好像只知皮毛，太粗浅了，会贻笑大方；有时是因为我们觉得脑中还不够有物，一片空白，像花心萝卜。“山穷水尽疑无路”，江郎才尽的滋味不好受。写不下去这是好事，否则马马虎虎、随随便便，硬着头皮写下去，连自己都不知道写什么，都觉得无聊，别人看了要后悔的文章，用一句俗话说：那是好丑嘀。这段文字意在说明（）。
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人类最好的天堂和最舒适的伊甸园就是我们赖以生息、繁衍的地球。______我们并不否认可能有外星人的存在，______即便有外星人的话，也是他们已经在外星进化和适应了千万年或上亿年，已经适应了太空和他们那个星球的环境，正如人类用了千万年或上亿年的时间才适应了地球的生活。______把探索太空想象成今后进入太空是家常便饭或移居太空生活，那就等于要费力去开拓人类另外的栖息地，几乎是另一种进化的从头开始，因而可能性也几乎是零。依次填入画横线部分正确的一项是（）。
The success of Augustus owed much to the character of Roman theorizing about the state. The Romans did not produce ambitious blueprints (1) the construction of ideal states, such as (2) to the Greeks. With very few exceptions, Roman theorists ignored, or rejected (3) valueless, intellectual exercises like Plato’s Republic, in (4) the relationship of the individual to the state was (5) out painstakingly without reference to (6) states or individuals. The closest the Roman came to the Greek model was Cicero’s De Re Publiea, and even here Cicero had Rome clearly in (7) . Roman thought about the state was concrete, even when it (8) religious and moral concepts. The first ruler of Rome, Romulus, was (9) to have received authority from the gods, specifically from Jupiter, the "guarantor" of Rome. All constitutional (10) was a method of conferring and administering the (11) . Very clearly it was believed that only the assembly of the (12) , the family heads who formed the original senate, (13) the religious character necessary to exercise authority, because its original function was to (14) the gods. Being practical as well as exclusive, the senators moved (15) to divide the authority, holding that their consuls, or chief officials, would possess it on (16) months, and later extending its possession to lower officials. (17) the important achievement was to create the idea of continuing (18) authority embodied only temporarily in certain upper-class individuals and conferred only (19) the mass of the people concurred. The system grew with enormous (20) , as new offices and assemblies were created and almost none discarded. 9（）
某企业对本月发生的外币业务按当日即期汇率进行折算，2009年1月1日国家公布的汇率为1美元=7.2元人民币。 该企业2008年12月31日有关科目余额如下(单位：元)：科目名称美元汇率人民币银行存款50007.135500应收账款250007.1177500应付账款100007.171000长期借款（工程项目尚未达到预定可使用状态）50007.135500 该企业2009年1月份发生下列经济业务： (1)该企业收回客户前欠账款15 000美元，当日汇率为1美元=7.15元人民币。 (2)将5 000美元存款兑换为人民币存款，兑换当日汇率为：买入价1美元=7.1元人民币，卖出价1美元=7.3元人民币，当日市场汇率为1美元=7.2元人民币。 (3)用银行存款5 000美元偿还应付账款，当日汇率为1美元=7.1元人民币。 (4)2009年1月31日用银行存款5 000美元归还长期借款。归还当日国家公布的汇率为1美元=7.3元人民币。 根据上述资料，回答下列问题： 2009年1月份归还的长期借款发生的汇兑收益为( )元。
若某计算机系统是由500个元器件构成的串联系统，且每个元器件的失效率均为10-7/h，在不考虑其因素对可靠性的影响时，该计算机系统的平均故障间隔时间为（）小时。
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