单项选择题

Hello! Aviation Electronics Could I speak to Mr. Jones on ______ 8866, please

A．extension
B．branch
C．system
D．exchange
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单项选择题
First designated in 1970, Earth Day has become an annual international event ______ concerns about environmental issues such as pollution.
A．dedicated to raising
B．dedicated raising
C．dedicated to raise
D．that dedicates to raising
单项选择题
The words Francis Key wrote on the back of an old letter The Star Spangled Banner became the national ______ of the United States.
A．song
B．hymn
C．anthem
D．motto
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