题目

任务型阅读 Today is a perfect day that Can leave you with good memories you may someday share with your friends．Here's how： You can see or do something a million times，but you can only see or do it for the first time once．As a result, first time experiences usually leave a deep mark in our minds for the rest of our lives．So try to experience something different and you'll have more memories． Work on something that's great to you．Life is short．Today is the day to take action，smile and notice what's right. Everything that happens in life is neither good nor bad．And no ma（2010•锦州）如图所示，在△ABC中，AB=AC，M，N分别是AB，AC的中点，D，E为BC上的点，连接DN、EM，若AB=5cm，BC=8cm，DE=4cm，则图中阴影部分的面积为（ ）A．1cm2B．1.5cm2C．2cm2D．3cm2