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【单选题】
患者女,68岁。慢性阻塞性肺疾病10年。 因咳嗽、咳痰加重,伴发热、喘息3天入院,给予氨茶碱等治疗。应用氨茶碱治疗的目的是A.
控制细菌感染
B.
減少支气管分泌物
C.
稀释痰液
D.
松弛支气管平滑肌
E.
降低体温
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【简答题】The Power of Positive Thinking Human emotion is one of those factors that cannot he definedexactly. The reason is that it is quite uncertain. We cannot change thefeelings that are roused when we exper...
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【简答题】The Power of Positive Thinking H uman emotion is one of those factors that cannot be defined exactly. The reason is that it is quite uncertain. We cannot change the feelings that are roused when we ex...
【简答题】什么是水生花卉？有什么特点？常见的水生花卉有哪些？如何应用
【多选题】How do point mutations in regulatory DNA sequences change our ability to digest lactose in milk?
A.
Our earliest ancestors were lactose intolerant, because the enzyme that breaks down lactose—called lactase—was made only during infancy. Adults, who were no longer exposed to breast milk, did not need the enzyme.
B.
When humans began to get milk from domesticated cattle some 10,000 years ago, variant genes—the product of random mutation—enabled those who carried the variation to continue to express lactase as adults, and thus take advantage of nutrition provided by cow’s milk.
C.
We now know that people who retain the ability to digest milk as adults contain a point mutation in the regulatory DNA sequence of the lactase gene, allowing it to be efficiently transcribed throughout life. In a sense, these milk-drinking adults are “mutants” with respect to their ancestors
D.
It is remarkable how quickly this adaptation spread through the human population, especially in societies that depended heavily on milk for nutrition. These evolutionary changes in the regulatory DNA sequence of the lactase gene occurred relatively recently (10,000 years ago), well after humans became a distinct species.
【简答题】水生花卉指什么？有哪些类型？
【简答题】This virus, called 2019-nCoV, is new and we are still learning about it. From what we know now, it can make some people (Q1) ____________________ with a slight (Q2) ________________. Other people get ...
【简答题】水生花卉对生境的需求有哪些特点？
【简答题】Answer the following questions and organize them into a paragraph. Cues are given at the end of each question. Combine the answers, using such words as which , but , since , because , as , and , for ,...
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