火山灰质硅酸盐水泥的代号是（）。

阅读表达。

     A common concern we often hear with regard to single

children is whether one child necessarily means a lonely child.

Many single-child parents feel a dilemma associated with their

decision to have only one child. There are no other children in the

family for the child to associate with, and this may lead to the

child feeling lonely at times, especially during vacations.

      Another common argument against having just one child is

that an only child may be more spoiled than one with brothers or

sisters. Many people believe that a single child will not have

learned to negotiate with others, and respect the give-and-take

involved in many relationships. Some think this may leave the

child less able to interact well with people his or her own age than

one who has been raised with brothers or sisters.

      However, for some single-child parents, particularly those

with busy careers, the pressures of giving time and energy to a

second child can seem too great,resulting in them electing to have

no more children. For other parents, the financial burden of having

a second child may be the prime consideration. Still others believe

that, ______, the parents can give,and the child can receive,

more quality time and attention. This often leads to increased self-

respect which, combined with increased independence, can lead

to the child being more confident.

1.What is the best title of the passage?  ( Please answer within10 words. )

____________________________________________________________________

2. Which sentence in the passage can be replaced by thefollowing one?

     Many single-child parents feel it hard to decide whether to  have only one child.

____________________________________________________________________

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

( Please answer within 10 words.)

____________________________________________________________________

4.  Would you like to have a brother or sister in your family? Why?( Please answer within 30 words.)

_____________________________________________________________________

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

______________________________________________________________________

每台上网的主机都有自己独特的Internet地址，这种地址一般有一种形式，即名称形式。（）

下面关于PC机键盘的叙述中，不正确的是()。

A．台式PC机键盘的按键数目现在已超过100个键，笔记本电脑受到体积的限制，按键数目仅为80多个

B．目前普遍使用的键盘按键都是电容式的，它的优点是击过声音小，无接触，不存在磨损和接触不良问题

C．PC机键盘向PC机输入的是8位串行的ASCII码

D．PC机键盘中包含有一个单片机，它负责键盘扫描、消除抖动、生成代码并进行并/串转换，然后将串行数据送往主机

使光纤产生损耗的原因很多，在散射损耗中，主要包括（）。

A.结构完整散射

B.线性散射

C.非线性散射

D.结构不完整散射

什么是瘕？