一个多边形有9条对角线，求这个多边形的边数？

顾客的消费心理复杂多变，会受到多种因素的影响。不属于文化、社会、心理因素的选项是（）

A.社会阶层

B.身体健康

C.自我观念

D.人口统计因素

风险责任划分，由发卡行承担的的损失有（）。

A.贷记卡被假冒、伪造、变造、办理挂失后被盗用而产生的损失

B.与银行卡国际组织、中国银联争议处理时发生的应由发卡行承担的损失

C.发卡行未按照贷记卡规程进行业务操作而产生的损失

D.信用卡中心未按照贷记卡规程进行业务操作而产生的损失

E.贷记卡系统由总行负责管理的部分运行发生异常导致无法正常处理业务而产生的损失

A bite of a cookie containing peanuts could cause the airway to constrict fatally. Sharing a toy with another child who had earlier eaten a peanut butter and jelly sandwich could raise a case of hives. A peanut butter cup dropped in a Halloween bag could contaminate the rest of the treats, posing an unknown risk.

These are the scenarios that "make your bone marrow turn cold" according to L. Val Giddings, vice president for food and agriculture of the Biotechnology Industry Organization. Besides representing the policy interests of food biotech companies in Washington, D. C., Giddings is the father of a four-year-old boy with a severe peanut allergy. Peanuts are only one of the most allergenic foods; estimates of the number of people who experience a reaction to the beans hover around 2 percent of the population.

Giddings says that peanuts are only one of several foods that biotechnologists are altering genetically in an attempt to eliminate the proteins that do great harm to some people’s immune systems. Although soy allergies do not usually cause life-threatening reactions, the scientists are also targeting soybeans, which can be found in two thirds of all manufactured food, making the supermarket a minefield for people allergic to soy. Biotechnologists are focusing on wheat, too, and might soon expand their research to the rest of the "big eight" allergy-inducing foods: tree nuts, milk, eggs, shellfish and fish.

Last September, for example, Anthony J. Kinney, a crop genetics researcher at DuPont Experimental Station in Wilmington, Del., and his colleagues reported using a technique called RNA interference (RNAi) to silence the genes that encode p34, a protein responsible for causing 65 percent of all soybean allergies. RNAi exploits the mechanism that cells use to protect themselves against foreign genetic material; it causes a cell to destroy RNA transcribed from a given gene, effectively turning off the gene.

Whether the public will accept food genetically modified to be low-allergen is still unknown. Courtney Chabot Dreyer, a spokesperson for Pioneer Hi-Bred International, a subsidiary of DuPont, says that the company will conduct studies to determine whether a promising market exists for low allergen soy before developing the seeds for sale to farmers. She estimates that Pioneer Hi-Bred is seven years away from commercializing the altered soybeans.

Doug Gurian-Sherman, scientific director of the biotechnology project at the Center for Science in the Public Interest—a group that has advocated enhanced Food and Drug Administration oversight for genetically modified foods—comments that his organization would not oppose low-allergen foods if they prove to be safe. But he wonders about "identity preservation" a term used in the food industry to describe the deliberate separation of genetically engineered and no nengineered products. A batch of nonengineered peanuts or soybeans might contaminate machinery reserved for low-allergen versions, he suggests, reducing the benefit of the gene-altered food. Such issues of identity preservation could make low-allergen genetically modified foods too costly to produce, Chabot Dreyer admits. But, she says, "it’s still too early to see if that’s true. \

According to the text, foods have been genetically altered to（）

A. taste more delicious

B. to cure people’s ineffectiveness in immune system

C. to promote sales of peanut

D. to lower the chance to get allergy

液化石油气储罐（）设防雷防静电接地装置。

A.不需；

B.必须；

C.不必；

D.可以

能行气止痛、降逆调中、温肾纳气的药是

A．佛手
B．沉香
C．青皮
D．川楝子
E．沉香