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听力题目：
19. (A). She’s done a great deal of traveling.
(B). There’s a good reason she’s late.
(C). She’s just finished her share of the work.
(D). Things have been difficult for her recently.
20. (A). This program on yeast isn’t too interesting.
(B). This program is quite interesting.
(C). All the programs are rather boring.
(D). This program is the most boring of all.
