问题
单项选择题 A1/A2型题
下列引起发作性咳嗽的是（）
A.慢性支气管炎
B.变异性哮喘
C.肺结核
D.肺脓肿
E.支气管扩张
答案
参考答案：B
解析：发作性咳嗽可见于百日咳、支气管内膜结核以及以咳嗽为主要症状的支气管哮喘（变异性哮喘）等。
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下列引起发作性咳嗽的是（）
A.慢性支气管炎
B.变异性哮喘
C.肺结核
D.肺脓肿
E.支气管扩张
参考答案：B
解析：发作性咳嗽可见于百日咳、支气管内膜结核以及以咳嗽为主要症状的支气管哮喘（变异性哮喘）等。
| 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. |
What does the author imply about lichens in Paragraph 1
A．They require a lot of moisture to live.
B．They primarily live in cold places.
C．They can live anywhere except around people.
D．They have adapted to a wide variety of environments.