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问题 单项选择题

郁金香是“花卉王国”荷兰的国花。郁金香在我国至今尚无普遍生产栽培的原因主要有（）。

A.土壤病虫害，有些地区的夏季高温，多雨

B.成本太高、没有足够的市场

C.花期集中春季、观赏期相对较短

D.国内栽培品种太少，品种质量差

答案

参考答案：A

句型转换

按要求做题.

1. Ben started to collect coins about 4 years ago. (改为同义句)

      Ben ____________  ____________ collecting coins for 4 years.

2. I don't have my own dictionary,so I have to share one with my brother. (改为同义句)

      I don't have a dictionary ____________ my ____________, so I have to share one with my

      brother.

3. He learned to swim when he was 7 years old. (改为同义句)

      He learned to swim ____________ ____________ ____________ ____________7.

4. He has been working for five years. (就画线部分提问)

      ____________  ____________ has he been working?

5. She asked me if I would go to the cinema the next day. (改为直接引语)

      She asked me, "____________  you ____________  to the cinema ?"
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单项选择题

对于主机架与扩展机架的连接，当使用CDU-C与3米射频电缆时，连接主架与扩展架HL-in及HL-out间的衰减器是哪种规格（）

A.2dB

B.3dB

C.1dB

D.4dB
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