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问题 单项选择题

* * 党员如果敢于坚持真理，那就必须同歪风邪气进行斗争；如果对错误的东西一味顺着、护着，只能助长不正之风的蔓延。因此( )

A．搞不正之风的人不是 * * 党员

B．只有 * * 党员才对不正之风进行斗争

C．敢于坚持真理的 * * 党员必定对歪风邪气进行斗争

D．所有的 * * 党员都对歪风邪气进行斗争

答案

参考答案：C

单项选择题

对于胶体的结构，叙述错误的是( )。

A．胶体由胶核、电位形成离子组成

B．胶体由胶核、电位形成离子、束缚反离子和自由反离子构成

C．胶体由胶核及其周围的双包层构成

D．胶体由胶核、吸附层和扩散层构成
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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.\

9（）

A.shows

B.denotes

C.indicates

D.hints
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