三、完形填空(共20小题;每题1.5分，共30分。)

　　通读下面的短文，掌握其大意。从每小题的四个选项中选出可填入相应空白出的最佳选择，并把它前面的大写字母填入左边括弧里。

　　The common cold is familiar to everyone. People often catch cold in __31_ winter or spring. They may __32_ catch cold at other times __33_ the year. A person with __34_ bad cold usually buys some __35_ of medicine. Pharmacies have many __36_ for a cold. However， doctors __37_ that these medicines do not __38_ very much. They that __39_ person with a bad cold __40_ stay in bad， keep warm， and drink a lot of water.

　　In 1928 an English doctor was working in his laboratory in London hospital. The doctor‘s name _41_ Alexander Fleming. One day he _42_ a tiny bit of mold (模型) _43_ a dish that he was _44_ in his work. He started _45_ throw the mold away. Then _46_ noticed that it seemed unusual. He _47_ the mold and studied _48_ for a long time. He _49_ that it could kill germs. He _50_ it penicillin.

　　( )31.A. a B. the C. some D. none

　　( )32.A. too B. also C. to D. still

　　( )33.A. at B. from C. of D. on

　　( )34.A. some B. a C. one D. the

　　( )35.A. kind B. set C. quantity D. deal

　　( )36.A. medicine B. much C. medicines D. doctors

　　( )37.A. tell B. speak C. talk D. say

　　( )38.A. helps B. help C. helping D. helped

　　( )39.A. many B. some C. a D. one

　　( )40.A. ought B. shall C. to D. should

　　( )41.A. is B. was C. called D. be

　　( )42.A. finding B. founded C. found D. finds

　　( )43.A. in B. among C. above D. into

　　( )44.A. playing B. using C. cooking D. making

　　( ) 45.A. to B. and C. but D. by

　　( )46.A. she B. Dr C. it D. he

　　( )47.A. kept B. keeps C. keep D. keeping

　　( )48.A. them B. mold C. it D. him

　　( )49.A. knew B. studied C. invented D. discovered

　　( )50.A. calls B. named C. made D. liked