Rationale Cloze: Exercise

Researchers from the National University of Singapore plan to form a company that develops and markets drugs derived from snake venom.

According __________ (9) Professor R. Manjunatha from the Department of Biological Sciences, the anti-clotting protein derived from the venom of the rough-scaled snake ___________ (10) as long term ____________ (11) for patients suffering from coronary heart disease ___________ (12) stroke. The venom can effectively __________ (13) down the formation of thrombin – an enzyme that ___________ (14) blood to clot. To make drugs, the useful proteins in snake venom are identified and ___________ (15) from the toxic elements that bring harm to humans.

9. A. to B. by C. of D. from
10. A. are used B. was used C. can be used D. has been used
11. A. medication B. medicated C. medicine
12. A. or B. but C. and D. as well
13. A. slow B. slows C. slowed D. slowing
14. A. cause B. causes C. caused D. is causing
15. A. separate B. separated C. separating