阻塞性黄疸病人的血清除哪项外，其余的酶都增高（） A.ChE B.AKP C.5’-

设N_A为阿伏加德罗常数，下列说法正确的是

A．标准状况下，5.6 L四氯化碳含有的分子数为0.25N_A

B．1 mol C₁₀H₂₂分子中共价键总数为30N_A

C．58.5g氯化钠可以构成N_A个氯化钠晶胞

D．标准状况下，22.4 L任意比的氢气和氯气的混合气体中含有的分子总数均为N_A

该网络采用核心层、汇聚层、接入层的三层架构，所有计算机都采用静态IP地址。为了防止恶意用户盗用IP地址，网管员可采用 (3) 的策略来防止IP地址盗用，该策略应在三层架构中的 (4) 层实施。
企业架设Web服务器对外进行公司及产品宣传，同时企业内部需架设数据库服务器存放商业机密数据，则Web服务器应放置在图19-4中的区域 (5) ，数据库服务器应放置在区域 (6) 。

阅读下面的短文，并根据短文后的要求答题（请注意问题后的字数要求）。

     Electronic devices (装置) are changing the way people listen to music. But studies show the devices may

be causing hearing loss in many people. Some experts say people may be playing them too loud and too long.

And experts say sound levels on these devices need to be set lower.

     Researchers did a study with three hundred high school students and one thousand adults. They were

asked about their use of portable music devices. Forty percent of the students and adults said they set the

sound levels at high on their players. But students were twice more likely to play the mu- sic at a very loud

volume (音量). More than half of the students said they would probably not limit their listening time.

     The study found that more than half of the students and less than forty percent of the adults had at least

one kind of hearing loss. Some reported difficulty hearing parts of a discussion between two people. Others

said they had to raise volume controls on a television or radio to hear it better. And, some experienced ringing

in their ears or other noises.

     Hearing experts say part of the problem is the listening equipment people are using. They say large

earphones that cover the whole ear are probably safer than the smaller earbuds (耳塞) that come with most

music players. Hearing loss may not be obvious for years, however, once it happens, there is few chance of

curing. About thirty million Americans have some hearing loss. One third of them lost their hearing as a result

of loud noises.

     The American Speech-language-Hearing Association is working with companies and government officials

on setting rules for use of portable music devices. The group says the best way to protect your hearing is

to _____, limit listening time and use earphones that block out foreign noises.

1. What is the best title of the passage? (Please answer within 10 words.) 

   _______________________________________________________________________________________ 

2. Which sentence in the passage can be replaced by the following one? Compared to adults, teenagers are 

    more likely to turn up their players.

    ______________________________________________________________________________________

3. Please fill in the blank in the last paragraph with proper words or phrases to complete the sentence. (Please

    answer within 10 words.) 

    ______________________________________________________________________________________

4. What trouble will happen to a person if he suffers some hearing loss? (Please give at least two examples

    mentioned in the passage, each within 15 words.

    ______________________________________________________________________________________

5. Translate the underlined sentence in the fourth paragraph into Chinese.

    ______________________________________________________________________________________

在流量测验中，测验垂线的编号可根据每次流量的测验顺序（）依次编列。

A、自一岸向另一岸

B、自中间向两岸

C、自最大水深向最小水深

D、自最大流速向最小流速

封建选官制度是政治制度的重要组成部分，阅读下列材料。材料一：“天下英雄，入吾穀中矣。”材料二：“太宗皇帝真长策，赚得英雄尽白头！"材料三：“缙绅虽位极人臣，不由进士者，终不为美。”

根据所学知识，回答这种选官制度产生的背景(4分)和意义？