D
血友病症状Depression is not a choice. Rather, it is a true medical condition like high blood pressure or heart dia. In the United States alone, more than 17 million people suffer from depression with women being twice as likely as men to suffer from the dia. Depression cross racial and socioeconomic lines. Anyone can suffer from it, and tho that do are not "crazy" or "weak". They have a rious yet highly treatable dia.
Feeling down? You’re not alone. If depression ems pretty common, it is. One in every ten adults suffers from depression. And that’s what has scientists confud. If depression caus harm to the body, why is it so widespread in the population? Some scientists think they may have the answer. Depression may have an evolutionary 进化 benefit. It may improve one’s chances of fighting off infection (感染).
Scientists have known that depresd people show an immunoreactive (免疫反应性的) condition known as inflammation
(炎症), even when they are not infected. For veral years they have been finding that genes (基因) linked to depression also affect the function of the immune system. Stress, which can lead to depression, also change the immune system. The findings suggested that depression was somehow linked to the body’s ability to fight dia.
Some scientists now come up with the idea that depression might have had an evolutionary advantage in the days before modern medicine and antibiotics (抗生素) Infection was a major cau of death in early human history. Surviving tho infections determined which genes were pasd to the next generation.
tiredness leads to inactivity and less social contact which helps keep infection from spreading. Having no appetite helps avoid food sharing which can also spread infection. Sleeplessness, which is associated with both depression and immune system activation, may have been a mechanism to keep a person alert(机
警) to fight off enemies after injury.
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If scientists are correct about this link, it could lead to new treatments for depression. They are interested in drugs that treat conditions where the immune system attacks the person’s own body, known as auto immune dias. It is possible that medicine known to treat auto immune dia may be successful in treating depression also.
56. The underlined ntence in Paragraph 1 means ____.
A. there is a depression line between different groups and societies
B. people at a higher social position may tend to suffer from depression
C. people who are living with depression could connect with each other
D. anyone can get depression whatever their economic states and backgrounds are
57. In Paragraph 2 the author ______.
A. introduces an idea on depression B. gives an example to show his idea 西四宅
C. explains how depression works D. describes the depression problems
58. According to the passage, which of the following is TRUE?
A. Depression can spread infection.
B. Stress may affect the function of the immune system
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. C. Women are less likely to suffer from depression.
D. Modern medicine is widely ud for treating depression.
4m3
59. The writer mainly wants to tell people that depression _____.
A. is rious but highly treatable dia
B. could have its advantages in scientific rearch
C. may improve one’s chances of fighting off infection
D. is a true medical condition like high blood pressure
