Researchers Chose same twins for their study mostly because they（   ）

• A、Shared the same DNA.
  
  

• B、looked alike
  
  

• C、had the same lifestyle
  
  

• D、grew up together
  
  

Task 1:

16、Para（   ）

17、Para（   ）

18、Para（   ）

19、Para（   ）

A.Taking good care of yourself.

B.Staying in bed for the entire day.

C.Taking your attention away from illness.

D.Knowing where and how to get medicine.

E.Informing friends and family of your illness.

The twins in the study differed in（   ）

• A、sleeping habits
  
  

• B、Exercise frequency.
  
  

• C、working hours .
  
  

• D、food preference