如图，在正方形ABCD中，对角线AC，BD交于点O，折叠正方形ABCD，使AD落在BD上，点A恰好与BD上的点F重合，展平后，折痕DE分别交AB，AC于点E，G，连接GF，下列结论：①AE=AG；②tan∠AGE=2；③S_$△DOG$=S_{四边形EFOG}；④四边形ABFG为等腰梯形；⑤BE=2OG，则其中正确的结论个数为（  ）。

A: Hi, Bill! Are you listening to MP4 again?

B: Yes, Tom. I'll never be tired of it.

A:____

B: I like music that I can sing along with.____

A: I prefer music that is quiet and gentle. ____

B: Oh, Jolin's songs have great lyrics. By the way, which group is your favorite?

A:____I prefer groups that can play different kinds of music.

B :____I also like Twins best. They take after each other, but the), are not really twins.

A: Really? Let's search the information on the Internet.

下列式子中是一元一次不等式的是（　　）