重大建筑工程和地震时可能发生严重次生灾害的建筑，属于（）类抗震设防建筑。A、甲 B、

Being the boss might mean more money and challenging work but it can also cause damage to physical and mental well-being, according to a Canadian study.

For years studies have shown people in lower-status jobs generally have higher rates of heart disease and other illnesses and die earlier than those in higher-status positions while job authority has shown no relationship with workers’ health.

But University of Toronto researchers, using data from 1,800 US workers, found the health of people in higher positions is affected by work as they are more likely to report conflicts with co-workers and say work disturbs their home life.

However, the positive aspects of having a power position at work, such as higher status, more pay and greater independence, seemed to cancel out the negative aspects when it came to people’s physical and psychological health.

These latest findings, reported in the journal Social Science & Medicine, suggest that the advantages and disadvantages authority positions basically cancel each other out, giving the general impression that job authority has no health effects.

For the study, the researchers surveyed participants about various aspects of their work, life and well-being. Job authority was judged based on whether a person managed other employees and had power over hiring, firing and pay.

Physical health complaints included problems like headaches, body aches, heartburn and tiredness. Psychological complaints included sleep problems, difficulty concentrating and feelings of sadness, worry and anxiety.

“This isn’t to suggest that having authority is ‘bad’—in fact, we show it has benefits ... but it is important to identify the negative sides and deal with them.” researcher Scott Schieman said.  

Schieman said conflicts with co-workers or involvement of work into home life may destroy at physical and mental well-being by creating stress.

“These are key stressors that can tax individuals’ ability to function effectively,” Schieman said.

56. Work will have a negative effect on job authority’s health probably because __________.

A. they are not fit for their work

B. they have power over hiring and pay

C. they are faced with severe competition

D. they don’t get on well with their co-workers

57. Most people don’t see that bosses have health effects because __________.

A. their health problems are not serious enough to see

B. they have enough money to keep themselves healthy

C. their problems are quite different from those of workers  

D. the advantages and disadvantages of their status work against each other

58. From the passage we can infer that the study aims to _________.

A. warn people not to be a boss for ever

B. remind the boss to deal with the bad effects of their work

C. show that having authority is harmful to one’s health

D. prove that being a boss can benefit a lot 

59. The best title for this passage might be ________.

A. Lower-status can affect health                  B. Authority can affect health

C. Positive aspects of a power position          D. Disadvantages of being a boss

凡不符合（）标准的车辆，不得运输危险货物。

A：二级车

B：三级车

C：一级车

激活的PKC能磷酸化的氨基酸残基是

A．酪氨酸/丝氨酸

B．酪氨酸/苏氨酸

C．丝氨酸/苏氨酸

D．丝氨酸/组氨酸

E．苏氨酸/组氨酸

血压的形成因素中，“心舒张期大动脉发生弹性回缩，又将一部分势能转变为推动血液的动能，使血液在血管中继续向前流动”属于（）

A.心脏射血

B.心动周期

C.大动脉回缩

D.毛细血管阻力

E.心血管系统充盈

软骨瘤的主要成分是（）

A.透明软骨

B.钙化的软骨

C.退化软骨所形成的假囊肿

D.骨化的软骨

E.骨细胞