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问题 选择题

离子方程式CO32－＋2H＋===CO2↑＋H2O表示[ ]

A．碳酸盐与盐酸之间的反应

B．一切碳酸盐与一切酸之间的反应

C．可溶性碳酸盐与酸之间的反应

D．可溶性碳酸盐与强酸之间的反应

答案

答案：D

单项选择题

新嘉年华车辆安全气囊系统在维修时应注意事项，下列正确的是？（）

A.RCM模块可以重复使用5次，但必须要检查气囊模块有无外部损坏，并使用自检进行诊断检查，然后方可编程再次使用

B.RCM模块只能使用一次，触发后无法再次使用

C.在更换新的RCM模块时，需借助IDS，利用“模块编程-可编程模组安装-RCM”进行编程

D.车辆发生碰撞后，通过惯性燃油切断开关可以断开油泵的电源供应
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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.\

10（）

A.business

B.commercial

C.trading

D.exchanging
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