Unit 4 周练答案一： 1-5 BCBCC 6-10 BAABC 11-15 ACBAB二：seldom, absent, failed, introduction, humorous三： A CCAB CBAAA四：CBBCA五。recently, almost/nearly, dare, regarded, others, talented, competition, personality, as, public六: noticed, turning, myself, even, against, trying, energy, unhealthy, somebody, well.七：BACEF