已知关于x的一元二次方程ax2+bx+c=0，如果a＞0，a+c＜b，那么方程a

Passage Two

Every market activity is an investment in time, energy and money. Few companies would spend a large sum of money on, say, a purchase of capital equipment without a full investigation into why it is needed, the choices available, and the expected return on what has been spent. Yet every year the vast majority of companies invest a large amount of money in marketing actions without knowing what their financial worth to the company or likely return will be. By introducing the disciplines arising from market planning, a company should be able to ensure that the costs of marketing planning show a reasonable return and are calculated in the same way as all other business investments.

Many managers believe that the costs of marketing form an additional expense that has to be accepted in order to sell their goods. Whilst it is true that many companies use certain tools of marketing for this purpose, it is also true that the most successful companies accept marketing as an essential part of the company’s total commercial operation, for it is an essential cost in the same way as production or finance.

Companies often avoid planning marketing procedures in detail because of the effort needed to express their forward policy in a written form. Managers commonly consider that their time is too valuable to spend on anything other than urgent operational problems. In fact, the manager who spends his time on dealing with current administrative detail is almost certain to have ignored proper planning in the past. For, if properly prepared, the marketing plan will contain sufficient details of the company’s policy and operational strategy for the work to be done by an assistant. As the many alternative courses of action are programmed, the assistant takes any actions or decisions which are appropriate. Only unusual situations need be dealt with by the manager.

The first step in preparing a marketing plan is that of producing the information necessary for decision making. Usually, a company will have within its own administration and control system the raw material necessary for the plan’s foundations. In addition, there is plenty of published information which is made available by government departments, institutions and the press.

Marketing research is yet to be fully exploited by the majority of companies. It has so far only been used by companies that have recognized that their existing information sources are inadequate. Because of the scale of operations that now confronts the typical businessman, it is essential that investment decisions are based upon relevant information, so reducing the business risk.

For a marketing-oriented activity to produce lasting results the entire operation has to be systematically planned. By producing basic information in written form and establishing aims for the future, the company is creating standards against which actual performance can be measureD. Documentation of detailed policy actions then provides the basis for controlling the company’s operation. Future trends may be predicted through the investigation of all factors likely to influence company results.

Why are marketing plans not written down by many managers ？（）

A．They do not have time to do it.

B．They know it would be difficult to do.

C．They never follow any particular marketing plan.

D．They do not think it is really necessary

如图是被子植物番茄花的部分结构示意图，请据图回答：

⑴番茄一般用种子繁殖后代，这种生殖方式属于  ▲ 生殖。

⑵①、②、③合称     ▲     ，它属于花的主要部分之一。

⑶受精作用完成后，④所示的     ▲    继续发育成种子。

⑷为了解决番茄抗冻的问题，科学家就将比目鱼的抗冻蛋白质基因转移到西红柿里，培育出了抗冻西红柿植株。这项技术称为      ▲    技术。

秦统一中国后“书同文”所用的文字是（）。

A．甲骨文

B．金文

C．小篆

D．楷书

人民代表大会制度：我国的根本政治制度    

（1）人民代表大会制度的组织和活动原则：______________。     

①人民代表大会与人民的关系上：人大代表由民主______________产生，对______________负责，受人民______________；重大问题的决策，按着______________的原则，民主决定；人民有权罢免不称职的人大代表。     

②人民代表大会与其他国家机关的关系上：一府两院由______________产生，对______________负责，受人大监督。     

③中央和地方国家机构的关系上：在中央的统一领导下，合理划分______________的职权。     

（2）人民代表大会制度的优势     

①决定因素：人民代表大会制度是由的国家性质决定的。     

②优越性：保障了______________、动员了全体人民投身于社会主义建设、保证了国家机关______________运转、维护了______________。

净化空调房间内外的正压差达不到要求，可能的原因（）

A、余压阀损坏

B、风机出风口的过滤网容尘量太大

C、风机的送风量太大

D、房间的密封性不好

E、送风口过滤网破损