（每小题1.5分，满分30分）请听下面5段对话。选出最佳选项。 1 how long has the meeting been put off? a for 5 minutes. b for 15 minutes. c for 25 minutes. 2 when will the speakers arriver in san francisco? a at 7:45 b at 6:45 c at 5:45 3 what book has the woman bought? a the math book. b the history book. c the english book. 4 why is the man standing outside the room? a he doesn’t have the key to the lock. b he is
