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问题 单项选择题

为了分离同一根光纤上多个用户的来去方向的信号，采用以下两种复用技术：下行数据流采用（）技术；上行数据流采用TDMA技术。

A.WDM

B.传输

C.物理

D.广播

答案

参考答案：D

句型转换

句型转换。

1. It's time for after-school activities. (同义句)

    It's time ______ ______ after-school activities.

2. Millie is a good swimmer. (同义句)

    Millie is good ______ ______.

3. Do you want to go shopping this weekend? (同义句)

    ______ you ______ to go shopping this weekend?

4. My brother does his homework every day. (改否定句)

    My brother ______ ______ his homework every day.

5. My father is a doctor. My mother is a doctor, too. (合并成一句)

    My parents ______ ______ doctors.

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单项选择题

文明礼仪是人类社会进步和发展的产物。对于个人来说，礼仪是一个人（）的一种外在表现。

A.知识水平、道德修养、理想信念

B.道德水平、处事原则、艺术修养

C.思想文化素质、道德修养、社会交际能力

D.心情
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