英语六级

单选题

A．To discover how long their ancestors lived.
B．To analyze how their appearance has evolved.
C．To find out how a disease has spread
D．To determine how closely groups of turtles are related.

参考答案：D进入在线模考
How is DNA used in research on green turtles?
细节题。根据then the turtles that have been going to the Ascension Island to nest would' ve been genetically isolated long enough to have DNA that was very different from the green turtles that nest else where.可知．有些乌龟到阿森松岛筑巢，由于地点偏远，脱离了主体，它们的DNA与其他乌龟不同了。因此，用DNA判断乌龟种族之间的远近度。因此，正确答案是D。

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1

A．To demonstrate George Washington's survival skills.
B．To show that some stories about famous people may be historically inaccurate.
C．To describe a historical event that was portrayed in a painting.
D．To tell a story that George Washington told about himself.

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2

A．She led her tribe to victory against the colonists
B．She was considered to be extremelybeautiful.
C．She created popular American Indian art.
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3

A．They have only recently been discovered.
B．They were painted by the colonists who knew her.
C．Most of them portray her as a child.
D．They might not reflect the fact of her life.

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