https://online2.tingclass.net/lesson/shi0529/0001/1240/17-07.mp3
https://image.tingclass.net/statics/js/2012
4. He always does something casually. So casually is a ______ in his character.
A. proficiency B. defect C. virtue D. appendix
<proficiency>
deficient 缺乏的
proficient 精通
efficient 有效的
sufficient 足够的
</proficiency>
<defect>
defect 缺点
perfect 完美，完善
affect 影响，侵袭
effect 效应，后果
</defect>
<virtue>
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
</virtue>
