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问题 单项选择题 A1型题

关于短暂性脑缺血发作以下哪项不正确（）

A.好发于50～70岁，男多于女

B.发作突然，历时短暂，每次发作持续不超过24h

C.常反复发作

D.每次发作出现的局灶症状符合一定血管供应区的脑功能

E.发作间歇，症状完全恢复，仅遗留轻微神经功能缺损

答案

参考答案：E

多项选择题

钢筋代换的方法包括（）

A、等强度代换

B、等体积代换

C、等面积代换

D、等直径代换

E、等重量代换
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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.\

12（）

A.created

B.developed

C.designed

D.formulated
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