数字用户线路接入种类很多，其中非对称数字用户线是 (64) 。光

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问题单项选择题

数字用户线路接入种类很多，其中非对称数字用户线是 (64) 。光纤接入网有多种，其中 (65) 是最理想的。

A．ADSL

B．VDSL

C．ISDN

D．HDSL

答案

参考答案：A

填空题

用所给单词的适当形式填空。

1. These words aren't descriptions for ________. (weigh)

2. Can you express your ________ (think) and ________ (feel) in a poetry?

3. There are some _________ (different) betweent a Haiku and a five-line poem.

4. He found it difficult ________ (write) a limerick.

5. Thanks for ________ (send) me so many postcards.

名词解释

智力G因素与S因素