[填空题]
Directions: This part consists of two short passages. In these
passages, there are altogether 20 mistakes. You may have to change a word, add a
word or delete a word. If you change a word, cross it out and write the correct
word in the corresponding blank. If you add a word, put an insertion mark ( ∧ )
in the right place and write the missing word in the blank. If you delete a
word, cross it out and put a slash (/) in the blank.
The improbable chain of events that leads Alexander Fleming
1. ______
to discover
penicillin in 1928 is the stuff which scientific myths 2.
______
are made. It was a discovery that would change the course
of the history. The active ingredient in that mold, which
Fleming
named penicillin, turned to be an
infection-fighting agent of 3. ______
enormous potency. When it was finally recognized as what it
was--the efficacious life-saving drug in the world--penicillin
4. ______
would a