34. The _______ carries nutrient-rich blood from the capillaries of the villi to the liver, then to the heart.
(A) hepatic portal artery
(B) hepatic portal vein
(C)superior vena cava
(D) hepatic vein
(E)common carotid artery

30. Which of the following organs belongs to both the lymphatic and endocrine systems? (A) Pancreas (B) Kidney (C)Thymus (D) Spleen (E)Thyroid gland

31. Which one of the following statements is NOT true? (A) Not every organism is able to exchange gas, nutrients, and waste with its environment directly. (B) Some small molecules can move between cells and their surroundings by diffusion. (C)Both arthropods and human beings have closed circulatory systems. (D) A circulatory system includes a circulatory fluid, a set of interconnecting vessels, and a muscular pump. (E)All of the above.

32. Which of the following is an example of a tissue? (A) blood (B) the heart (C)a red blood cell (D) the respiratory system (E)the spleen

33. _______ produces the alkaline solution to neutralize the acidity of chyme. (A) Pancreas (B) Liver (C)Gallbladder (D) Small intestine (E)Stomach

35. Which one of the following statements is NOT true? (A) Fish gills use a countercurrent exchange system to increase blood flow. (B) In fish gills, more than 80% of the O2 dissolved in the water is removed as water passes over the respiratory surface. (C)In human lungs, cilia and mucus line the epithelium of the air ducts and move particles up to the pharynx. (D) Respiratory surfaces are always thin and moist. (E)All of the above.

36. Which one is secreted by cytotoxic T cells? (A) histamine (B) perforin (C)IgG (D) IL-1β (E)None of the above.

37. Which of the following is true of innate behaviors? Innate behaviors __________.(A) are only weakly influenced by genes (B) occur in invertebrates and some vertebrates but not mammals (C)are limited to invertebrate animals (D) are expressed in most individuals in a population (E)None of the above.

38. What is cell mediated immunity? (A) presence of antigen cause B cell to proliferation and differentiate into plasma cells and memory B cells. (B) effector T cells are needed to eliminate intracellular pathogens (within intracellular vesicles of cells following phagocytosis (CD4) or in the cytoplasm of infected cells (CD8) (C)occurs during thymic education, T cells that react with antigens present before birth are deleted to eliminating self-reactivity. (D) heterodimer produced by macrophages and dendritic cells. Major cytokine to induce differentiation. of CD4+ T cells into TH1 cells. (E)All of the above.

39. How do T cell receptor recognize antigen? (A) Antigen receptors of T cell bind to antigens on the surface of a virus. (B) the antigen receptors on the surface of the helper T cell bind to antigen fragments complex with class-I MHC molecules on the antigen-presenting cell. (C)accessory protein CD8 on the helper T cell surface binds to the MHC molecules, helping keep the cell-cells joined. (D) an antigen fragment binds to an MHC molecule and then displayed to the cell surface. The combination of MHC molecule and antigen is recognized by T cell. (E)None of the above.

40. The major function of the colon is the absorption of _______ and _______. (A) minerals； water (B) peptides； minerals (C)water； vitamins (D) minerals； vitamins (E)peptides； vitamins