单项选择题

People in a large area any possess the same DNA thread because______.

A．DNA is characteristic of a region
B．they are beyond doubt of common ancestry
C．DNA strand has the ability to identify individuals
D．their unique identification can be provided via DNA
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单项选择题
The Molecular Genealogy Research Group is building a database for the purpose of______.
A．offering assistance in working out genealogy-related problems
B．solving many issues without relying on traditional written records
C．providing a pedigree chart of at least four generations in the world
D．confirming the assumption that all individuals are of the same origin
单项选择题
The author thinks that the trend towards a rapid rise in consumption was undesirable because______.
A．people saved less
B．people were wealthy
C．people consumed less
D．costs on luxuries increased
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