当遇到“infer”题型时，答案不能从文章中直接得出，需要理解文章意思然后揣测作者的意图来做题。
示例：
We may infer from the second paragraph that______.
A. DNA technology has been widely applied to history research
B. In its early days the US was confronted with delicate situation
C. Historians deliberately made up some stories of Jefferson’s life
D. Political compromises are easily found throughout the US history
