GRE阅读练习题及答案（33）

　　25. It can be inferred from the passage that the purpose of Colonno’s experiments was to determine whether
　　(A) chimpanzees and humans can both be infected by rhinoviruses
　　(B) chimpanzees can produce antibodies to human cell-surface receptors
　　(C) a rhinovirus’ nucleic acid might be locked in its protein coat
　　(D) binding antibodies to common receptors could produce a possible defense against rhinoviruses
　　(E) rhinoviruses are vulnerable to human antibodies
　　26. According to the passage, Rossman’s research suggests that
　　(A) a defense against rhinoviruses might exploit structural similarities among the strains of rhinovirus
　　(B) human cells normally do not develop antibodies to components of their own cells
　　(C) the various strains of rhinovirus differ in their ability to bind to the surface of a host cell
　　(D) rhinovirus versatility can work to the benefit of researchers trying to find a useful antibody
　　(E) Colonno’s research findings are probably invalid
　　27. According to the passage, in order for a given antibody to bind to a given rhinoviral capsid, which of the following must be true?
　　(A) The capsid must have a deep “canyon” on each of its faces.
　　(B) The antibody must be specific to the molecular structure of the particular capsid.
　　(C) The capsid must separate from its nucleic acid before binding to an antibody.
　　(D) The antibody must bind to a particular cell-surface receptor before it can bind to a rhinovirus.
　　(E) The antibody must first enter a cell containing the particular rhinovirus.