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问题 单项选择题

通常在某一Cluster中建成并开通正常站点占总数的（）以上，并且保证基本连续覆盖的时候，就可以进行RF优化（）

A、80％

B、85％

C、75％

D、70％

答案

参考答案：A

补全对话，情景问答

根据方框中提示完成对话。

A: What’s that in English?
B: It’s 1._____ 2._____.
A: And what are those? Are those buses?
B: No, 3._____ 4._____. They are 5._____.
一辆吉普车。另外有三辆在一起，距离稍微远一点。
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单项选择题

Questions 81-90 are based on the following passage.


It sounds like a science fiction, but researchers say it’s a scientific fact: Microscopic organisms dubbed "killer algae" are paralyzing fish with unknown toxins and then eating away at their flesh. They might be making people sick, too.
The name given to this single-cell organism, or dinoflagellate, is Pfiesteria piscimorte- literally, "fish killer. " It was discovered at North Carolina State University in 1988, but at the same time, few scientists believed in its existence, much less in its highly unusual predatory nature. But ongoing research has led to international acknowledgment of the phenomenon and, recently, research funding.
Seemingly prompted by an unknown substance secreted by fish, the aggressive creature swims into action. It sends neurotoxins into the water and air, paralyzing a fish’s nervous system, and causing it to gasp for air at the surface. Eventually the fish suffocates. The killer dinoflagellate then attaches itself to the fish and begins sucking away at its flesh. This macabre scenario may help solve several sea mysteries, such as why fishermen report seeing "fish walks" (fish trying to leave the water) and pools of dead fish with holes eaten through them.
Whether humans are affected by the dinoflagellate’s toxin remains to be seen. Researchers think it’s unlikely eating fresh fish are in danger, but anyone with frequent exposure to the creature could be in peril. Several researchers working with the algae have reported bouts of memory loss and disorientation.
To understand the killer algae further, scientists must fully characterize their toxin and determine what stimulates them to attack. They also need to know if the algae are hurting fish populations, and whether pollutants make them more likely to attack.

All the following names are used to describe the organism EXCEPT ______.

A. dinoflagellate


B. Pfiesteria piscimorte
C. killer algae


D. a science fiction
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