简述灭火的基本方法及其原理。

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.\

8（）

A.popular

B.common

C.ordinary

D.widespread

下列关于利用物业共用部位、共用设施设备经营应当遵守的规定的相关内容，说法正确的是（）。

A.利用共用部位、共用设施设备经营需要征得相关业主的同意是因为经营行为可能对其权益造成影响

B.关于利用共用部位、共用设施设备经营所得经营收益的使用问题，应当优先用于补充住宅专项维修资金

C.利用共用部位、共用设施设备经营需要征得业主大会的同意是因为业主大会代表和维护着物业管理区域内全体业主的合法权益

D.相关业主是指直接受到利用共用部位、共用设施设备经营行为影响的所有业主

E.利用共用部位、共用设施设备经营需要经过物业服务企业的同意是由物业服务企业的服务性质和服务内容决定的

客户需求的分析和运用的内容包括（）

A、客户的月销量

B、明确客户需求类别

C、了解客户需求的结构

D、客户需求与企业需求相结合

某化工进出口公司下属某厂以进料加工贸易方式进口原料一批，经海关运抵港口后，进口报关单的“商品编号”栏应填报为该货物的加工贸易手册的编号。 ( )

松材线虫原产北美洲，通过松墨天牛等媒介昆虫传播，引发松树病害。松材线虫是一种毁灭性虫害，相继在江苏、安徽、广东和浙江等地成灾，导致松树大面积死亡。下列有关叙述不正确地是（）

A.松材线虫在北美洲的危害不严重是因为有大量的自然天敌存在

B.人工松林中的松树大面积死亡提高了生态系统的恢复力稳定性

C.利用松墨天牛天敌防治天牛，有利于控制松材线虫的扩散传播

D.丰富度大的森林不易发生松材线虫的爆发