阅读理解
Since we are social beings, the quality of our lives depends in large measure on our interpersonal
relationships. One strength of the human conditions is our possibility to give and receive support from
one another under stressful conditions. Social support makes up of the exchange of resources among
people based on their interpersonal ties. Those of us with strong support systems appear better able to
deal with major life changes and daily problems. People with strong social ties live longer and have better
health than those without such ties. Studies over types of illnesses, from depression to heartdisease, show
that the presence of social support helps people defend themselves against illness, and the absence of
such support makes poor health more likely.
Social support cushions stress in a number of ways. First, friends, relatives and coworkers may let us
know that they value us. Our selfrespect is strengthened when we feel accepted by others in spite of our
faults and difficulties. Second, otherpeople often provide us with informational support. They help us to
define and understand our problems and find solutions to them. Third, we typically find social
companionship supportive. Taking part in freetime activities with others helps us to meet our social
needs while at the same time distracting(转移注意力)us from our worries and troubles. Finally, other
people may give us instrumental support-money aid, material resources, and needed services-that
reduces stress by helping us resolve and deal with our problems.
1. Interpersonal relationships are important because they can________.
A. make people live more easily
B. smooth away daily problems
C. deal with life changes
D. cure types of illnesses
2. The researches show that people's physical and mental health________.
A. lies in the social medical care systems which support them
B. has much to do with the amount of support they get from others
C. depends on their ability to deal with daily worries and troubles
D. is related to their courage for dealing with major life changes
3. Which of the following is closest in meaning to the underlined word "cushions"?
A. takes place of
B. makes up of
C. lessens the effect of
D. gets rid of
变为多少？（提示：以无穷远处为零势能点，质量为m的质点在上述天体表面的引力势能为EP=-GMm/R）
，那么请写出天体质量与半径的比（M/R）跟引力红移（z）的关系式。