C Immune troops eliminating intruders.
D A sea of microbes.
37 The immune cells and other cells in the body coexist peaceably in a state known as
A balance.
B harmony.
C tolerance.
D self-tolerance.
38 How do the immune cells recognize an antigen as foreign or nonself?
A Through characteristic shapes on the antigen surface.
B Through an allergic response.
C Through blood type.
D Through fine hairs protruding from the antigen surface.
39 Which of the following statements is true?
A Allergens are usually harmful substances.
B Antigens can trigger an immune response.
C People with antigens do not suffer from obvious responses.
D There is no difference between an antigen and an allergen.
40 Which of the following best expresses the main idea of this passage?
A The basic function of the immune system is to distinguish between self and nonself.
B An antigen is any substance that triggers an immune response.
C One of the immune systems primary functions is the allergic response.
D The human body is an appropriate habitat for microbes.
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