What is the speaker talking about

A．The chemical and physical features of plastics.
B．The process of public acceptance of plastic as a modem material.
C．The history of plastics as a modem material.
D．The advantages of plastics to people.

A．Because she felt relaxed there.
B．Because there were always many people.
C．Because Number 10 was not her real home.
D．Because she had to share her husband with his work and his aide.