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问题 单项选择题

重度哮喘时，除吸氧外还应采取哪些措施

A．应用糖皮质激素、支气管扩张剂，维持水电解质平衡，控制感染

B．尽快找到过敏原，去除诱因，或进行脱敏疗法

C．大剂量抗生素及脱敏疗法

D．应用支气管舒张剂，色甘酸钠

E．吸入β2受体激动剂，应用茶碱控释片，吸入糖皮质激素

答案

参考答案：A

单项选择题

Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live. Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌). But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist Martin Bidartondo of the University of California at Berkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, says Bidartondo, but also suggests that many ordinary plants might prosper from a little looting, too.

Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called my corrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon with a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment.\

15（）

A.in turn

B.in fact

C.in return

D.in the end
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单项选择题

典型麻疹的出疹顺序是

A．先耳后、四肢，后躯干、手掌、足底

B．先躯干，后四肢，最后头面部

C．先前胸，后背部，渐延至四肢、手掌、足底

D．先从耳后、颈部延至额面部，然后躯干、四肢

E．先额部、面部，后躯干、四肢
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