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问题 单项选择题

宋·朱肱《类证活人书》提出（）。

A．“冬伤於寒，至春发者，谓之温病；冬不伤寒而春自感风寒温气而病者，亦谓之温”

B．运用麻黄汤、桂枝汤等治疗外感病，必须因时、因地、因人而灵活加入寒凉清热等药

C．“岁中有厉气，兼夹鬼毒相注，名曰温病”

D．“温病不得混称伤寒”

E．“人感乖戾之气而生病”

答案

参考答案：B

多项选择题

施工图预算可作为( )的依据。

A．签订工程施工合同

B．选择最优设计方案

C．向建设单位办理工程结算

D．国家批准设计任务书

E．银行拨付工程价款
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单项选择题

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.

Which of the following does the writer explain

A. Neurotoxins.


B. Microscopic organisms.
C. Predators.


D. Fish walks.
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