单项选择题

The report shows that poor families spend a large ______ of their income on food.

A．fraction
B．sector
C．section
D．proportion
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单项选择题
The former mayor didn' t have a chance to win the election. Almost all of the people in the city voted for his ______.
A．candidate
B．opponent
C．alternative
D．participant
单项选择题
Due to ______ research which had taken years to complete, the scientist proudly presented her findings at the national convention.
A．intensive
B．complex
C．alternative
D．extensive
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