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问题 单项选择题

男性，20岁，踢足球时扭伤膝部2个月，常有"打软"，绞锁疼痛史，查：膝不肿，关节外侧间隙有压痛，外侧挤压疼（+），前后抽屉试验（-），关节活动正常，最可能诊断（）

A.内侧半月板撕裂

B.外侧半月板撕裂

C.外侧副韧带损伤

D.前交叉韧带损伤

E.后交叉韧带损伤

答案

参考答案：B

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.\

5（）

A.others

B.the others

C.other

D.the other
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单项选择题

股指期货合约的涨跌停板幅度为上一交易日结算价的（）。

A．±5% 

B．±10% 

C．±20% 

D．±50%
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