题干
Nicotine is a drug(药) that gets one into the __________ of smoking.
A：habit
B：custom
C：harm
D：rule
答案(点此获取答案解析）
A
Nicotine is a drug(药) that gets one into the __________ of smoking.
A：habit
B：custom
C：harm
D：rule
为定义在
上的奇函数，当
时，
(
为常数)，则
（ ）
