问题
单项选择题 共用题干题
患者男性，5岁，因“多牙龋损”来诊。患者患自闭症，生活不能自理，不能与人交流。口腔检查：患龋牙数（DT）为16，龋损严重，多牙需行牙髓治疗。
最佳治疗方案是（）
A.保护性固定
B.口服镇静药
C.全身麻醉下治疗
D.观察
E.局部麻醉下治疗
答案
参考答案：C
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患者男性，5岁，因“多牙龋损”来诊。患者患自闭症，生活不能自理，不能与人交流。口腔检查：患龋牙数（DT）为16，龋损严重，多牙需行牙髓治疗。
最佳治疗方案是（）
A.保护性固定
B.口服镇静药
C.全身麻醉下治疗
D.观察
E.局部麻醉下治疗
参考答案：C
| Lichens may grow on the bark of a tree in a steaming tropical rain forest, on the bricks of big city buildings, on rocks in hot springs, on wind-swept mountaintops, and in the driest desserts. In the arctic, they provide the principal food for caribou, and they are one of the few plants that grow in Antarctica. They are pioneers, appearing in barren rocky areas and starting the formation of soil in which mosses, then ferns, and then other plants can take root. Lichens are a partnership of two plants — fungi and algae. The lichen body is made up of a network of fungal strands. In the upper layers of these grow groups of algae. The two organisms live together to the benefit of both, a relationship known as symbiosis. The fungi provide support, absorb water, and shelter the tender algae from direct sunlight. The algae carry on photosynthesis and provide the fungi with food. The algae can live independently and are recognizable as a species that grows alone. The fungi, on the other hand, cannot live apart from their partners. They can be placed in known classes of fungi but are unlike any species that lives independently. So definite are the form, color, and characteristics of these double organisms that for hundreds of years, they were classified as one. More than 15,000 "species" were named. If these organisms are classified as separate species, it is difficult to fit them into the existing system of classification. But if they are classified separately, these species of fungi seem rather strange. Lichens are a splendid example of the difficulties faced by taxonomists in classifying species. |
The word "barren" underlined in Paragraph 1 most probably means _______ .
A．lifeless
B．frigid
C．hard
D．uncovered