折算率是由交易所会同证券登记结算机构根据国债利率及( )，对所有在交易所上市的国债

Annette Kellerman was born in Australia in 1887.She had polio and could not walk easily.She had to wear metal supports on her legs to stand up on her own.To make her legs stronger,her mother took her for swimming lessons every week.Swimming made her legs so strong that when she was 15 she was able to throw away her supports.

Her family was poor so she got work acting as a mermaid.She wore a long tail and fish swam around her.People paid to come and see her.

In 1900 Annette swam in the Paris Olympics and won two gold medals. The next year she tried to swim across the Channel.She was the first woman to try to do it though she had to stop after swimming for six hours.

In 1915 Annette went to Hollywood and was the star of two films.

小题1:Annette Kellerman was born ________ in 1887.

A．in England

B．In France

C．In America

D．in Australia小题2:She had to wear metal supports on her legs to stand up on her own because ______.

A．She had polio and couldn’t walk easily

B．Her family was poor

C．Her leg was hurt in an accident

D．She couldn’t swim小题3:Her mother took her for swimming lessons every week ______.

A．to make her a famous swimmer

B．to make her legs stronger

C．to make her swim faster

D．to make her win gold medals小题4:In 1990, Annette swam in the Paris Olympics and won two ________.

A．supports

B．fish

C．gold medals

D．films小题5:Which of the following is true according to the passage?

A．she was successful in swimming across the Channel

B．In 1901 she tried to swim across the Channel but later she had to stop.

C．She wasn’t able to throw away her supports at the age of fifteen.

D．She swam across the Channel for only six days

出现哪些情形，评标委员会应当否决其投标（）。

A.投标报价低于成本或高于招标文件设定的最高投标限价

B.投标文件没有对招标文件的实质性要求和条件作出响应

C.投标人有串通投标、弄虚作假、行贿受贿等违法行为

D.投标文件符合招标文件要求

下列句子中没有语病的一项是[ ]

A．我的家乡是江苏省如东县人。

B．弟弟不但瘦，而且精神饱满。

C．这样就达到了避免产生阻力。

D．全班同学都做出了这道数学题。

中性点接地系统的变压器，在进行冲击合闸时，其（）必须接地。

阅读下文并回答问题：

送孟东野序（唐）

韩愈

大凡物不得其平则鸣。草木无声，风挠之鸣。水之无声，风荡之鸣。其跃也或激之，其趋也或梗之，其沸也或炙之。金石之无声，或击之鸣。人之于言也亦然，有不得已者而后言，其謌也有思，其哭也有怀。凡出乎口而为声者，其皆有弗平者乎！乐也者，郁于中而泄于外者也，择其善鸣者而假之鸣。金、石、丝、竹、匏、土、革、木八者，物之善鸣者也。维天之于时也亦然，择其善鸣者而假之鸣。是故以鸟鸣春，以雷鸣夏，以虫鸣秋，以风鸣冬。四时之相推敚，其必有不得其平者乎！其于人也亦然。人声之精者为言，文辞之于言，又其精也，犹择其善鸣者而假之鸣。其在唐、虞、咎陶、禹，其善鸣者，而假以鸣。夔弗能以文辞鸣，又自假于《韶》以鸣。夏之时，五子以其歌鸣。伊尹鸣殷，周公鸣周。凡载于《诗》、《书》六艺，皆鸣之善者也。„„从吾游者，李翱、张籍其尤也。三子者之鸣信善矣。抑不知天将和其声而使鸣国家之盛邪？抑将穷饿其身、思愁其心肠而使自鸣其不幸邪？三子者之命，则悬乎天矣。其在上也，奚以洗？其在下也，奚以悲？东野之役于江南也，有若不释然者，故吾道其命于天者以解之。

本文的主旨是什么？作者是如何论述主旨的？