单项选择题

In the U.S., the senatorial term is ______years.

A．3
B．4
C．6
D．8
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单项选择题
Shall I compare thee to a summer's day This is the beginning line of one of Shakespeare's ______.
A．songs
B．plays
C．comedies
D．sonnets
单项选择题
The fact that ability to speak a language is transmitted from generation to generation by a process of learning, and not genetically is usually referred to as ______.
A．performance
B．language acquisition
C．cultural transmission
D．competence
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