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问题 单项选择题

存量房出租和承租代理业务中，第六步是房屋租赁价格谈判及租赁合同签订，在租赁合同签订（）日内，房屋租赁双方当事人持有关部门证明文件到市、县人民政府房屋管理部门办理登记备案手续。

A.10

B.15

C.20

D.30

答案

参考答案：D

解析：在租赁合同签订后30日内，房屋租赁双方当事人持有关部门证明文件到市、县人民政府房产管理部门办理登记备案手续。

单项选择题

JT－C系列机车信号车载系统设备的可选部分为（）。

A.机车信号主机（含机车信号记录器）

B.机车信号机

C.机车信号远程监测数据传输模块

D.双路接收线圈
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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.\

20（）

A. instead of

B. in spite of

C. in place of

D. by contrast of
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