4. He always does something casually. So casually is a ______ in his character.
A. proficiency B. defect C. virtue D. appendix
deficient 缺乏的
proficient 精通
efficient 有效的
sufficient 足够的
defect 缺点
perfect 完美,完善
affect 影响,侵袭
effect 效应,后果
virtue 优点,美德
virus 病毒
virose 有毒的
virgin 处女
Virgo 处女星座
appendix 附录,附属物