2. 外语
  3. Stress Can Make You Sick Scientists are now studying a new field of research which is called psychoimmunology(心理免疫学). It is b

Stress Can Make You Sick Scientists are now studying a new field of research which is called psychoimmunology(心理免疫学). It is b

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问题                                            Stress Can Make You Sick
   Scientists are now studying a new field of research which is called psychoimmunology(心理免疫学). It is based on the idea(51)people who are depressed(抑郁) or have a lot of stress are more likely to become sick. Researchers have recently found a connection between diseases and stressful situations. To test this theory scientists are trying to find a link(52)the brain and the immune(免疫)system. The immune system in our bodies fights the bacteria and viruses which cause disease. Therefore,(53)or not we are likely to get various diseases depends on how(54)our immune system works. Biologists(55)to think that the immune system was a separate,(56)part of our bodies. Recently, however, they have found that our brain can affect our immune system. This discovery indicates that there may(57)a connection between emotional factors, such as stress or depression, and illness.
   Although many doctors in the past(58)a connection between emotional factors and disease, they had no proof. Scientists have only recently discovered(59)the brain and the immune system function. Before this, no one could see a link between them. As a result, medical science never(60)considered the idea that psychological factors could(61)disease.
   Several recent studies(62)a connection between stress and illness. For instance, researchers went to an American military school to study the students. By studying the students’ blood, they found that many were(63)with a virus which causes mononucleosis(单核细胞增多症), a common glandular (腺体的) disease. Of the infected students, only 5 percent actually became ill. The sick students had a lot of academic(64)and wanted to achieve, but they were not very good students. In a similar study, researchers studied a group of student nurses. They focused(65)cold sores, which are also caused by a common virus. Many student nurses carried the virus in their blood, but few of these infected nurses actually developed cold sores.
选项 A、if
B、whether
C、how
D、when
答案B
解析
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