[名词解释]Immune tolerance

[名词解释]Peripheral tolerance

[名词解释]Split tolerance

[名词解释]Low zone tolerance and high zone tolerance

[单项选择]
The immune system is equal in complexity to the combined intricacies of the brain and nervous system. The success of the immune system in defending the body relies on a dynamic regulatory communication network consisting of millions and millions of cells. Organized into sets and subsets,these cells pass information back and forth like clouds of bees flying around a hive (蜂巢). The result is a sensitive system of checks and balances that produces an immune response that is prompt, appropriate effective, and self-limiting.
At the heart of the immune system is the ability to distinguish between self and no self. When immune defenders encounter cells or organisms carrying foreign or nonself molecules,the immune troops move quickly to eliminate the intruders(入侵者). Virtually every body cell carries distinctive molecules that identify it as self. The body’s immune defenses do not normally attack tissues that carry a selfmark
A. The immune system’s memory.
B. Immune troops eliminating intruders.
C. Bees flying around a hive.
D. A sea of microbes.

[名词解释]Peripheral immune organ

[名词解释]Mucosal immune system

[名词解释]Central immune organ

[名词解释]Immune privileged sites

[单项选择] AIDS AIDS is Acquired Immune Deficiency Syndrome. The human immunodeficiency virus (人类免疫缺损病毒)called HIV is believed to cause AIDS. There is no cure. People who get the disease will die. AIDS itself does not kill. However, it attacks and destroys the body’’s defense system that fights against infection. When this happens, a person has little ability to fight off many other diseases including pneumonia(肺炎), cancer and tuberculosis (结核病). A new study says the number of women in the United States with AIDS has increased sharply. The study says AIDS is increasing faster among women than among men. Eighteen percent of AIDS patients are women. This is almost 3 times the rate 10 years ago. Most women get the AIDS virus from having sexual relations with men. Pregnant women with the disease can pass it to their babies. The effect of AIDS in America is greatest in large cities. AIDS is the leading cause of death among all people in 79 cities. It is th
A. These museums are empty, nothing can be seen there.
B. Most workers in these museums have gotten AIDS.
C. They protect what is called AIDS culture.
D. They honor people who have died of AIDS.