机会成本告诉我们（）。 A.选择的代价，我们应该进行最优而不是次优选择：所谓物尽其用

（）突出强调了对资产业务、负债业务风险的协调管理，通过对资产与负债的结构和期限的共同调整、经营目标的互相代替以投资产分散实现总量平衡和风险控制。

A.资产风险管理

B.负债风险管理

C.资产负债风险管理

D.全面风险管理

根据建设工程施工合同示范文本，承包人在施工场地遇到的不可预见的自然物质条包括地下和水文条件，但不包括（）。

影响离子通道开关的配体主要是（）（）

A.神经递质

B.类固醇激素

C.无机离子

D.生长因子

E.甲状腺素

阅读理解。

      Researchers have found more evidence that suggests a relationship between races and rates(率)

of lung cancer among smokers. A new study shows that black people and Native Hawaiians are more

likely to develop lung cancer from smoking. It compared their risk to whites, Japanese-Americans and

Latinos.

     Researchers at the University of Southern California and the University of Hawaii did the new study.

The New England Journal of Medicine published the findings. The eight-year research studied more than

180,000 people. They included present and former smokers and people who never smoked. Almost

2.000 people in the study developed lung cancer.

     Researchers say genetics(遗传学) might help explain the racial and ethnic(种族的) differences.

There could be differences in how people's bodies react to smoke. But environmental influences,

including the way people smoke, could also make a difference.

      African-Americans and Latinos in the study are reported smoking the fewest cigarettes per day.

Whites are the heaviest smokers. But the scientists point out that blacks have been reported to breathe

cigarette smoke more deeply than white smokers. This could fill their lungs with more of the chemicals

in tobacco that cause cancer.

      Scientists know that some diseases effect different groups differently. And some drug companies

have begun to develop racially targeted(针对) medicines. Last June, the United States Food and Drug

Administration approved a drug designed to treat heart failure in black patients. The name is BiDil. The

agency called it "a step toward the promise of personalized medicine."

1．Which of the following orders is from higher to lower risk of having lung cancer?

A．Whites-Native Hawaiians

B．Africans-Americans-Latinos

C．Asians-Native Hawaiians

D．Africans-Americans-Native Hawaiians

2．Researchers agree that it is      that may probably determine black people's risk of lung cancer.

A．the larger amount of smoking than white people

B．the living style or habit of the blacks

C．the depth of cigarette smoke into their lungs

D．the physical strength to react to cigarette smoke

3．People in the new study are made up of          .

A．heavy smokers in America

B．the black and white people

C．the Asians and Hawaiians

D．smokers and non-smokers

4．The production of BiDil referred to in the last paragraph is to      .

A．explain different races react to some diseases differently

B．tell the readers that racial differences exist in smokers

C．show a big step people have taken in the medicine area

D．support the idea that it is easy for blacks to have cancers

5．Which of the following statements is TRUE according to the author?

A．The way of smoking may increase the risk of lung cancer.

B．Race has nothing to do with the risk of having a lung cancer.

C．The research was started by the New England Journal of Medicine.

D．The risk of lung cancer lies I how much a person smokes.

学校产生于( )。

A．原始社会
B．奴隶社会
C．封建社会
D．资本主义社会