搜题请搜索小程序“爱下问搜题”
问题 单项选择题

在下列引起代谢性酸中毒的原因中，哪一项是错误的（）。

A.急性腹膜炎

B.休克

C.长期禁食

D.长期反复呕吐

E.急性肾衰竭

答案

参考答案：D

解析：长期反复呕吐是导致代谢性碱中毒的常见原因。

选择题

读下面两幅漫画，要解决地球和农民的困惑，我们必须

[      ]

①实行保护环境和节约资源的基本国策

②落实科学发展观

③实施可持续发展战略

④实行对外开放的基本国策

A．①②③  

B．②③④  

C．①②④  

D．①③④
查看答案
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
查看答案