题目内容：
We may infer from the second paragraph that
A．DNA technology has been widely applied to history research.
B．in its early days the U.S. was confronted with delicate situations.
C．historians deliberately made up some stories of Jefferson's life.
D．political compromises are easily found throughout the U.S. history.
参考答案：【答案仅供学习，请勿对照自行用药等】