File:89C12-31

12. B. This question tests the candidates' ability of understanding the context, and the collocation. Since it is experimental, it is successfully to unclog coronary arteries.

13. D. This question tests the candidates' ability of understanding the context, and the collocation. `Surgery' collocates with `techniques'.

14. D.This question tests the candidates' ability of understanding the context. Since it is `experimental' and `successful', it will `revolutionize' because it is related to sth new.

15. A. This question tests the candidates' ability of understanding the context, and the collocation. `Reduction' collocates with `the number of'.

16. A. This question tests the candidates' ability of understanding the context, and the collocation. `Marked' collocates with `the first time'.

17. D. This question tests the candidates' ability of understanding the context, and the collocation. `Unblock' refers to the flow of blood in the coronary arteries.

18. B. This question tests the candidates' ability of understanding the context. We can see from the next line that `we can clean the inoperable coronary arteries' suggests the laser has the potential to cure patients suffering from blocking of the coronary arteries.

19. C. This question tests the candidates' ability of understanding the context, and the collocation. `Monitored' because of `progress' as well as the period, `during the six months.

20. C. This question tests the candidates' ability of understanding the context, and the collocation. `Considered' inoperable means `cannot be worked out', but in fact, it can.

21. C.This question tests the candidates' ability of understanding the context, and the collocation. `Mean' suggests `convey the idea' that coronary arteries can be cleaned out.

22. C.This question tests the candidates' ability of understanding the context, and the collocation. `Subjecting' collocates with `surgery', causing sth to go through the process of having the surgery.

23. B. This question tests the candidates' ability of understanding the context, and the collocation. `Cool' is the antonym of `hot', collocates with `pass through the head of a match.

24. A. This question tests the candidates' ability of understanding the context, and the collocation. `Igniting' collocates with `a match'.

25. D. This question tests the candidates' ability of understanding the context, and the collocation. `Thermal' collocates with `damages'. We can get the clue from the next line: unclogging arteries often cause damage.

26. C. This question tests the candidates' ability of understanding the context, and the collocation. `Traditional' collocates with `methods'.

27. D. This question tests the candidates' ability of understanding the context. `Blood running' is in the form of a line.

28. B. This question tests the candidates' ability of understanding the context, and the collocation. `Patients had gone well' collocates with `condition' in hospital.

29. D. This question tests the candidates' ability of understanding the context, and the collocation. `Recovery room' collocates with `hospital'.

30. A. This question tests the candidates' ability of understanding the context, and the collocation. `Estimates' collocates with either number or time, here it collocates with `would need three weeks'.

31. A This question tests the candidates' ability of understanding the context, and the collocation. `Recuperate' collocates with `discharged from hospital.