如图平行四边形ABCD中，∠ABC=60°，点E、F分别在CD、BC的延长线上，AE∥BD，EF⊥BF，垂足为点F，DF=2

（1）求证：D是EC中点；

（2）求FC的长．

阅读短文，下列问题

    In the world today, all of the people need to have fun when they are free. We can't work all the time if we are going to keep healthy and enjoy life.

    Everyone has his own way of relaxing. Perhaps the most popular form (形式) is to take part in sports. There are team sports, such as basketball and football. There are also individual(个人的) sports, such as swimming and running. Skating and mountain climbing are the most popular recreation (消遣) for people who like to be outdoors.

Not everyone who enjoys sports likes to take part in them. Many people like watching them on TV or listening to them on the radio. So many people like some indoor relaxation, such as watching TV, singing and dancing.

    It doesn't matter if we like indoor recreation or take part in outdoor sports. It is important for everyone to relax from time to time, and enjoy some themselves.

如图所示，a、b两个由不同材料制成的直柱形物体，高h_a＜h_b，底面积S_a＞S_b，若放在同一水平的沙面上时，它们陷入的深度相同，则下列判断正确的是（　　）

根据对话内容，从下列选项中选出能填入空白处的最佳选项，其中有两个为多余选项。

— Hello. Gerry speaking.

— Hello, Gerry. It's me John here. {#blank#}1{#/blank#} .

— Well, I'm terribly sorry, but I'm not feeling very well.

— Is that all?{#blank#}2{#/blank#}

— No, I'm sorry. I was sick all night. I think it must be the fish I ate last night.

— Well, I think you should have at least phoned Kate and told her you weren't coming to the meeting.

— {#blank#}3{#/blank#} I'm sorry about that. Anyway, I think I'll be able to get in to work tomorrow.

— {#blank#}4{#/blank#} 

— I won't. Thanks for calling.

— {#blank#}5{#/blank#}.

A. Why didn't you phone?                 

B. OK. Take care and don't eat any more fish.

C. Why weren't you here at the meeting?      

D. That's all right.

E. We thought you might have had an accident or forgotten the day or something.

F. I'll be glad to see you again.          

G. Yes, I suppose I should have done so.