实现了话音编码的主要目的是为了（） A.降低话音的比特速率；

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问题单项选择题

实现了话音编码的主要目的是为了（）

A.降低话音的比特速率；

B.克服无线信道上的误码；

C.提高A-BIS接口的PCM的利用率；

D.使话音变得简单易听清楚。

答案

参考答案：A

阅读理解

任务型阅读。阅读短文，回答下列问题。

Dear Li Ming

Thank you for your e-mail. I love autumn, too. In Canada, we have an autumn holiday called Thanks-

giving Day. Family members celebrate it together. I will go to my grandmother and grandfather's house.

My uncles, aunts and their children will be there, too.

Canadian Thanksgiving Day is in early October. In the USA they celebrate Thanksgiving Day in late

November.

Have a good time on your birthday, Li Ming! On my birthday, I have a cake with candles. Everyone

sings the song Happy Birthday. Then I blow out the candles! Will you have a cake for your birthday?

Your friend

Jenny

1. Which season do Li Ming and Jenny like?

__________________________________________________________

2. When do Americans celebrate Thanksgiving Day?

__________________________________________________________

3. When is Canadian Thanksgiving Day?

__________________________________________________________

4. Do Canadians usually stay together on Thanksgiving Day?

__________________________________________________________

5. What will everyone sing for Jenny on her birthday?

__________________________________________________________

填空题

无砟道床底座裂纹Ⅱ级伤损宜采用（）修补。