_______ can help gather the information received by the brain.

A．Helping the poor.
B．Offering medical service to patients.
C．Helping people around you.
D．Feeding birds in the parks near your community.

A．They are losing their ability to remain confident.
B．They are losing their ability to express themselves clearly and accurately.
C．They are unable to study a foreign language.
D．They are unable to lose weight.