双人CPR，胸外心脏按压与人工呼吸次数的比例为（） A.9∶1 B.7∶1 C.30

国家农业发展银行所承担的任务是( )。

A．农业政策性贷款

B．国家重点建设项目融资

C．支持进出口贸易

D．支持国家开发项目融资

机车的制动力主要由空气制动装置产生。

阅读理解。

     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 mtes 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 l, 800 US workers, found the health of people

in higher positions is affected by work as they are rnore 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 indeperldence, 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 thelr work, life and well-

being. Job authority was judged based on whether a person nlanaged 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 lt is lmportant

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 physical

and mental well-being by creating stress.

     "These are key stressors that can tax individuals' ability to function effectively," Schieman said.

1. 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

2. 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

3. From the passage we can infer that the study aims to _____. [ ]

A. warn people not to be a boss forever

B. remind the boss to deal with 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 1ot

4. 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

学生是学习的______，是具有能动性的教育对象。

燕莎中心是一座综合性建筑群，主要经营高档名牌商品，服务对象以（）为主。