TCP/IP在多个层次引入了安全机制，其中TLS协议位于 （ ） 。A．数据链路

折旧率随着使用年限的变化而变化的固定资产折旧计算方法是（）。

A．平均年限法

B．双倍余额递减法

C．年数总和法

D．工作量法

阅读理解

     Many people have tried to simplify (简化) the spelling of English words.Unlike other languages,English sometimes spells the same sounds in very different ways.For example,there is "light" but "white","loan" but "phone",and there are at least seven different ways of pronouncing "ough":"though","through","bough","

cough","enough","ought" and "thorough"．

     The American President Theodore Roosevelt almost succeeded in simplifying English spelling.In 1906,Andrew Carnegie started the Simplified Spelling Board.He was one of the richest men in the United States of America.The board's plan was to make the spelling of words nearer to the way they sound.For

example,the word "though" would be spelt "tho" and "through" would become "thru"．Other people on the board were Melvil Dewey,the head of the New York libraries,and Professor Brander Matthews of

Columbia University.They explained their idea to President Roosevelt,who thought that it was indeed

logical.He immediately asked the government printer to use simplified spelling in all government letters.

But people didn't like the change,even if it made life easier.So the new simpler spelling was not popular.

More importantly,when the American politicians (政客) discussed the plan,they did not like it either.

Because Roosevelt did not want to have any problems with the politicians,he changed his mind and told the printer to go back to the old way of spelling.

     Since then no one in any government has dared to simplify English spelling.However,people do simplify some words,mainly in advertisements.For example,we often see "tonite" instead of "tonight" and "thru"

instead of "through"．

1. Many people have tried to simplify English spelling because________.

A. English words are too long to remember

B. there are many mistakes in English words

C. lots of words are spelt in many different ways

D. sometimes the same sounds have different spellings

2. Who is NOT a member of the Simplified Spelling Board?

A. Andrew Carnegie.  

B. Melvil Dewey.

C. Theodore Roosevelt.  

D. Brander Matthews.

3. What was Theodore Roosevelt's attitude towards simplified spelling?

A. Worried.  

B. Supportive.  

C. Uncertain.  

D. Doubtful.

4. According to the passage,simplified spelling________.

A. was welcomed by the US politicians

B. changed the way the words sound

C. has been used widely for over a century

D. was first used in US government letters

5. Roosevelt's plan to simplify English spelling________.

A. failed in the end  

B. proved quite successful

C. won wide support  

D. influenced English greatly

在纯电感电路中没有能量（），只有能量（）。

患者，男，48岁。原发性肝癌手术治疗后出院，门诊复查中，下列哪项不是必需的检查

A．肝功能

B．肝脏B超

C．癌胚抗原(CEA)

D．甲胎球蛋白

E．胸部X线片

（）主肌肉，人肌肉是否丰满与其有直接关系。

A、心

B、肝

C、脾

D、肾