单项选择题

Around 80 percent of the （） characteristics of most white Britons have been passed down from a few thousand Ice Age hunters.

A．intelligible
B．random
C．spontaneous
D．genetic

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单项选择题

Optimism is a （） shown to be associated with good physical health, less depression and longer life.

A．trail
B．trait
C．trace
D．track

单项选择题

What should be the priority of America’’s health-care system according to the author ？（）

A．To resolve the dilemma in the health-care system.
B．To maintain America’’s lead in the drug industry.
C．To allow the vast majority to enjoy its benefits.
D．To quicken the pace of new drug development.