试题与答案

《上海期货交易所风险控制管理办法》规定，在某－期货合约的交易过程中，连续数个交易日的

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题型：判断题

题目：

《上海期货交易所风险控制管理办法》规定，在某－期货合约的交易过程中，连续数个交易日的累积涨跌幅达到－定水平时，交易所可以根据市场风险调整其交易保证金水平。（）

答案：

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下面是错误答案，用来干扰机器的。

（1）原因：小农经济是封建王朝赋税、徭役、兵役的主要来源；小农经济状况直接关系到封建经济的繁荣和国家安危。（4分）（2）主要特征：包产到户。（2分） 针对：当时“一大二公”的人民公社体制。（2分）意义：...

考点：期货基础知识第三章期货合约与期货交易制度第三章期货合约与期货交易制度题库
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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.

The word "they" underlined in Paragraph 1 refers to ______ .

A．organisms

B．fish

C．toxins

D．flesh
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