第一节：完形填空(共10小题；每小题2分，满分20分)
阅读下面短文，掌握其大意，然后从2l-30各题所给的四个选项(A、B、C和D)中，选出最佳选项，并在答题卡上将该项涂黑。
It’s an age-old saying: Men are from Mars; women are from Venus. Males and females __21_ different behaviors almost from birth. Researchers say these behaviors are due to basic differences in __22_ structure and activity. Studies show men are better at hitting targets and __23__ math problems while women are better at memorizing words and_24__faces. Why the differences?
