A． Because they could bring a special feeling to the participants.
B． Because they could produce a desirable experimental result.
C． Because they could stimulate participants' bold imagination.
D． Because they could evoke sweet memories in people's mind.
A． Words trigger a memory better than images and pictures.
B． Forgetting caused by remembering occurs in an instant.
C． Brain activity is suppressed when pictures are shown.
D． The researchers can watch how the brain suppress memories.
A． It makes more children under five suffer from diseases related with malnutrition.
B． It makes about two billion people die from diarrhea each year.
C． It leads to poor quality of life and environmental health problems.
D． It slows the economic growth of the whole world.
A． The booming economy helps all the people in India shake off poverty.
B． The rapid urbanization is the biggest obstacle hindering its further development.
C． India is bound to embrace a rapid economic development soon.
D． Government should put the priority on sanitation and clean water for economic development.