下列条件不利于聚落的形成与发展的是

菱形ABCD中，∠B=60°，点E在边BC上，点F在边CD上．

（1）如图1，若E是BC的中点，∠AEF=60°，求证：BE=DF；

（2）如图2，若∠EAF=60°，求证：△AEF是等边三角形．

    When you are feeling unhappy or forget how great you are，these are six ways to make you feel good about yourself．
1) Look in the mirror (镜子) and say to yourself，“I am a special person and there's no one  in the world like me．I can do anything!” It may not sound so good，but it really works !
2) Do something nice for someone．Helping others always makes you feel good．
3) Smile! Be friendly to people you meet．Look for the good things in your friends and family．
4) Learn something new! Do you always want to decorate（装饰）your own room or learn how to swim? Go for it! New challenges (挑战) are fun and give you a sense of accomplishment when you have finished．
5) Read and start a diary（日记）．Turn off the TV and let your imagination (想象) fly! Write down your thoughts，dreams or anything you want! Writing always helps to express（表达）your feelings．
6) Stay with your family．We all need our family time．Talk with your Mum or Dad or maybe even your cousin．