一条绳子对折一次后，又对折了一次，这时每折长8m，这根绳子原来长多少米？

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    Sandra's restaurant is a new restaurant on Green Road．It's open(营业)for lunch and dinner．It is open from eleven in the morning to eleven in the evening．

Sandra's restaurant is a great restaurant．It's very happy and relaxing to have dinner there．When you enjoy the food there，you can listen to beautiful songs(歌曲)．You can find a lot of delicious food there，like chicken，fish，rice，noodles．tomato soup and all kinds of salads．You can also taste two kinds of special bread．The restaurant owner(主人)makes the bread．It tastes really great．You can also have ice．cream there．There is always a special on ice．cream every Monday．

    It is not an expensive restaurant.  You'll find that the waiters are very friendly．

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如图，四边形ABCD中，AD∥BC，E是DC上一点，连接BE并延长交AD延长线于点F，请你只添加一个条件：____使得四边形BDFC为平行四边形．

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