单项选择题

"Nation” as a free root can function alone in a sentence while "diet" is a ______, which can not function alone grammatically and has to combine with other morphemes to create new words.

A．active root
B．fixed root
C．non-free root
D．bound root
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单项选择题
The United Kingdom is a unitary, not a federal, state and its Parliament consists of the Sovereign, the House of Lords and ______.
A．the House of Representatives
B．the House of Senates
C．the House of Councilors
D．the House of Commons
单项选择题
The Australian Federal Parliament is modeled on ______.
A．the Westminster system
B．the White House system
C．the United Nations system
D．the Aboriginal system
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