室温下，某溶液中水电离出的H＋和OH－的物质的量浓度乘积为1×10－26，该溶液

已知函数f(x)=x²+2ax+l，其中a∈[-2，2]，则函数f(x)有零点的概率是（    ）。

重大关联交易指（）。

A.上市公司拟与关联人达成的总额高于300万元的关联交易

B.上市公司拟与关联人达成的总额高于500万元的关联交易

C.上市公司拟与关联人达成的总额高于上市公司最近经审计净资产值的3%的关联交易

D.上市公司拟与关联人达成的总额高于上市公司最近经审计净资产值的5%的关联交易

The world hash’t seen a pandemic（流行疾病）in 4 1 years，when the”Hong Kong”flu crossed the globe and killed about one million people worldwide．If H1N1 flu（甲型流感）reaches pandemic levels，what would happen next?

The outbreak of SARS in 2003 rang alarm bells as potential pandemics．Although it jumped the”animal-to·human”barrier，neither disease changed enough to enable human-to．Human infection．Strictly speaking，SARS did not become pandemics because it was too good at killing their hosts．For a pandemic，it needs to be able to maintain human-to．human contact without killing its host off．

”H1N1 flu is already a man-to-man disease，which makes it much more difficult to manage．

And H1N1 flu appears much more infectious than SARS．

But the WHO warns，it cannot say whether or not it will indeed cause a pandemic．According to experts，here’s what the world might see if there is another pandemic，based on past experience．

The disease would skip from city to city over an 18-to-24 month period，infecting more than a third of the population．World health Organization officials believe as many as 1．5 billion people around the globe would seek medical care and nearly 30 million would seek hospitalization．Based on the last pandemic and current world population，as many as 7 million people could die．Hospitals will become overcrowded；schools will close；businesses will close；airports will be empty．Business will become very bad，as people avoid as much social contact as possible．

Health facilities will become overrun with patients and there would be less-than-adequate staffing，as medical health professionals fall ill themselves and that would result in higher deaths．

The very young and very old will likely be the most susceptible（易受感染的）to the illness．Experts warn，much is still unknown about the current H1N1 flu virus and its severity and it is too early to say whether it will lead to a pandemic．Right now，the focus is on finding answers and controlling the spread．

小题1:How many kinds of disease is mentioned in the passage?

A．Two

B．Three

C．Four

D．Five小题2:Which of the following statements is NOT true according to the passage?

A．SARS didn’t change enough to enable sustained（持续的）human-to—human infection．

B．SARS was very good at killing its carriers．

C．A man with H1N1 flu can not infect another man easily．

D．Comparing SARS and H 1N 1 flu，SARS is not as infectious．小题3:What can we know about the “Hong Kong” flu from the passage?

A．It spread all around the globe and killed lots of people．

B．It killed about millions of people．

C．It killed about one million people in Hong Kong．

D．Not the old but the young were susceptible to it and got killed．小题4:What can be inferred from the passage?

A．The H1N1 flu will skip from city to city over an 18一to一24 month period．

B．Doctors and nurses will fall ill themselves，which will result in many more deaths．

C．Every country is taking measures to stop the H1N1 flu from leading to a pandemic．

D．The WHO and experts have known much about the current H1N1 flu virus．

脑性瘫痪定义的三要素为

A．发育性、暂时性、进行性

B．发育性、永久性、进行性

C．发育性、永久性、非进行性

D．成熟性、非进行性、永久性

E．成熟性、进行性、永久性

如果一个群体有很高的凝聚力，绩效规范却很低，则群体（）

A.仍然能取得很高的生产率

B.生产率通常比较低

C.生产率比凝聚力低的群体高

D.生产率比绩效规范高的群体还要高