283.I called the airline to _____ my flight reservation a week before I left for Canada.
A.obtain
B.admit
C.confirm
D.appoint
284.If your race car isn't insured, you may _____ losing everything when it hits something solid.
A.delay
B.deny
C.avoid
D.risk
283.答案是C;obtain获得，得到；admit承认，公认;/confirm/i证实，巩固，确认;appoint委派，任命。
284.答案是D;delay耽搁，延误;deny否认;avoid避免:冒险。此处risk doing sth.冒险干某事。
