（1）

E

E

While these compulsive （無(wú)法控制的） actions may appear to be irrational or pointless，and may even result in negative consequences，the individual experiencing the compulsion feels unable to stop himself or herself.
   The compulsive behaviour can be a physical act，like hand washing，or a mental activity，like counting objects.When an otherwise harmless behaviour becomes so consuming that it negatively impacts oneself or others，it may be a symptom of obsessive-compulsive disorder （OCD）（強(qiáng)迫癥）.
   （2）

A

A

The former is an overwhelming desire to do something，while an addiction is a physical or chemical dependence on a substance or behaviour.People with addictions will continue their addictive behaviour，even when they understand that doing so is harmful to themselves and others. （3）

F

F

   Unlike compulsions and addictions，which are acted out uncontrollably，habits are actions that are repeated regularly and automatically.
   Habits typically develop over time through a natural process called "habituation"，during which repetitive actions that must be consciously initiated eventually become subconscious and are carried out habitually.
   While there are good habits and bad，unhealthy habits，any habit can become a compulsion or even an addiction. （4）

B

B

For example，the good habit of exercising regularly can become an unhealthy compulsion or addiction when done to excess.
   Common habits often develop into addictions when they result in a chemical dependency，as in the cases of smoking.The habit of having a glass of beer with dinner，for example，becomes an addiction when the desire to drink turns into a physical or emotional need to drink.
   （5）

G

G

While we can choose to add good，healthy habits to our routines，we can also choose to break old harmful habits.

A.A compulsion is different from an addiction.
B.In other words，you really can have "too much of a good thing".
C.It currently affects about 1 in 40 adults and 1 in 100 children in the US.
D.Some of these behaviours are visible actions while others are mental behaviours.
F.Alcoholism，smoking，and gambling are perhaps the most common examples of addictions.
E.Compulsive behaviours are actions that a person feels "compelled" or driven to do over and over again.
G.Of course，the key difference between a compulsive behaviour and a habit is the ability to choose to do it or not.