单项选择题

Government reports, examination compositions, legal documents and most business letters are the main situations( )formal language is used.

A．at what
B．in that
C．on which
D．in which
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In the opinion of many people, Australia has the best( )in the world.
A．weather
B．climate
C．temperature
D．custom
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It is necessary for students to take tests at monthly( ).
A．intervals
B．times
C．periods
D．terms
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