Because the other witnesses were killed mysteriously, he______(成了这个案件中唯一的证人).

A. Selfless caregivers tend to have a longer lifespan.
B. Caregivers are more likely to die from heavy workload.
C. Caregivers should turn to community volunteers for help.
D. The longer a person offers care, the less likely he is to die.

A. The majority of parents in the world keep positive connections with children.
B. Most parents don’t get along well with their adult children, especially in US.
C. American parents are the most successful in dealing with parent-children relationships.
D. Conflict has been a striking theme in the relationships of parents and their children.