______ is generally defined as the study of meaning and usually pays attention to the study of meaning of linguistic units themselves, words and sentences in particular, which has always been a central topic in human scholarship.

A．Every year.
B．Every four years.
C．Every two years.
D．Every three years.

A．to mediate between the two parties.
B．to distinguish them as two countries.
C．to invite Hamas leaders to Paris.
D．to legitimize terror in Palestine.