四、語文填空(21-35 題，請選出最適當的選項)
 Passage 1        An equally significant breakthrough resulting from Pasteur’s work was the idea of __21__ —killing bacteria on surgical instruments and other surfaces rather than introducing them into apatient’s body during surgery. After several years of hard work, Louis Pasteur’s long career __22__  in an enormously significant contribution to humankind—the vaccine. The concept of vaccinationhad existed at least since the end of the 18th century, when the English physician Edward Jennernoticed that people who had come down with a disease from cattle called cowpox were less likelyto __23__ smallpox. Jenner began to introduce material from infected cows into people, with somepositive results. Pasteur pursued Jenner’s idea and took one step forward by studying fowl cholera,a disease fatal to chickens. His experiments were interrupted by a summer vacation, and whenPasteur returned to the laboratory, he found that his cholera cultures were no longer lethal. Inaddition, he found that chickens __24__ this new weakened strain of the disease were not killedwhen they were later exposed to a lethal cholera culture. Pasteur’s work with weakened forms ofdiseases soon resulted in a vaccine against rabies. The vaccine famously saved the life of a shepherdboy named Joseph Meister when it __25__ after an attack by a rabid dog. Eventually, theknowledge that microscopic germs were the source of disease and infection led to vaccines to fighttyphus, polio, measles, and other deadly diseases.
【題組】21.
(A) antisepsis
(B) antiknock
(C) antihero
(D) antipathy