问题
单项选择题 A1/A2型题
颈椎牵引对下列哪种类型的颈椎病治疗效果最佳？（）
A.神经根型
B.椎动脉型
C.脊髓型
D.混合型
E.以上均可
答案
参考答案：A
解析：颈椎牵引在临床上可用于颈椎病的任何型，但效果最为肯定（或最佳）的应该是神经根型；椎动脉型和脊髓型在临床上运用颈椎牵引常常是疗法不够肯定，有时还会加重其症状，是属于谨慎使用的类型。
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颈椎牵引对下列哪种类型的颈椎病治疗效果最佳？（）
A.神经根型
B.椎动脉型
C.脊髓型
D.混合型
E.以上均可
参考答案：A
解析：颈椎牵引在临床上可用于颈椎病的任何型，但效果最为肯定（或最佳）的应该是神经根型；椎动脉型和脊髓型在临床上运用颈椎牵引常常是疗法不够肯定，有时还会加重其症状，是属于谨慎使用的类型。
| 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. |
The passage is primarily concerned with ______.
A．informing readers of different sea creatures
B．describing predatory microscopic organisms
C．solving some long-lasting mysteries about the sea
D．discussing the environment for various fishes