简述建构主义学习的共同点？

外源化学物主要与何种血浆蛋白质发生可逆结合（）

A.白蛋白

B.α₁球蛋白

C.α₂球蛋白

D.β球蛋白

E.γ球蛋白

It snowed heavily for three days      and they were separated from the outside world.

A．in the end

B．on end

C．by the end

D．at the end

边坡加固措施：（）、削顶压底、用混凝土填塞岩石断裂部分、用锚栓或预应力缆索加固、挡墙和锚索相连接加固、用混凝土挡墙或支墩加固、（）。

阅读理解。

      If you are a male and you are reading this, congratulations: you are a survivor. According to statistics,

you are more than twice as likely to die of skin cancer than a woman, and nine times more likely to die of

AIDS. Assuming you make it to the end of your natural term, about 78 years for men in Australia, you will

die on average five years before a woman. 

      There are many reasons for this, men take more risks than women and are more likely to drink and

smoke, but perhaps more importantly, men don't go to the doctor.

      "Men aren't seeing doctors as often as they should," says Dr. Gullotta, "This is particularly so for the

over-40s, when diseases tend to strike." Gullotta says a healthy man should visit the doctor every year or

two. For those over 45,it should be at least once a year.

      According to a recent survey, 95%of women aged between 15 and early 40s see a doctor once a year,

compared to 70% of men in the same age group.

      "A lot of men think they are invincible (不可战胜的)" Gullotta says "They only come in when a friend

drops dead on the golf course and they think 'Dear me, if it could happen to him, …'"

      Then there is the ostrich (鸵鸟) approach, "Some men are scared of what might be there and would

rather not know," says Dr. Ross Cartmill. "Most men get their cars serviced more often than they service

their bodies," Cartmill says. He believes most diseases that commonly affect men could be addressed by

preventive check-ups. Regular check-ups for men would inevitably (不可避免地) place stress on the public

purse. Cartmill says. "But prevention is cheaper in the long run than having to treat the diseases. Besides, the

final cost is far greater."

1. Which is the most important reason why men die five years earlier on average than women according to

    the passage? [ ]

A. Men drink and smoke much more than women.

B. Men aren't as cautious as women in face of danger.

C. Men don't seek medical care as often as women.

D. Men are more likely to suffer from fatal diseases.

2. Which of the following best completes the sentence "Dear me, if it could happen to him,…" in paragraph5? [ ]

A. I should avoid playing golf.

B. I should consider myself lucky.

C. it would be a big misfortune.

D. it could happen to me, too.

3. What does Dr. Ross Cartmill mean by "the ostrich approach" in paragraph 6? [ ]

A. A new treatment for certain psychological problems.

B. Refusal to get medical treatment for fear of the pain involved.

C. Unwillingness to find out about one's disease because of fear.

D. A casual attitude towards one's health conditions.

4. What does Cartmill say about regular check-ups for men?[ ]

A. They may increase public expenses.

B. They will save money in the long run.

C. They may cause psychological stress on men.

D. They will enable men to live as long as women.

生理机制和社会文化是心理现象产生的两种根源。