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问题 多项选择题

人与动物的不同在于，人知道自己为什么活着，明白人生的意义。我们应这样去探索人生的意义[ ]

A．保持积极乐观的人生态度

B．追求消极的人生目标

C．追求积极向上的人生目标

D．充分利用有限的今天

答案

ACD

单项选择题

男性，50岁，近半年采出现大便次数增多，腹泻、便秘交替出现，粘液血便，感腹胀，腹部隐痛，乏力，体重下降7公斤。查：血常规血红蛋白70g/L

术前护理错误的是

A．完全胃肠外营养

B．心理护理

C．清洁肠道

D．手术日晨放置胃管

E．手术日晨留置导尿管
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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.\

1（）

A.but

B.if

C.because

D.though
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