题目

The true value of life is not in ______, but _______. A . which we get; what give we B . what we get; what we give C . which do we get; what do we give D . how we get; that we give 答案：B11．如图，在正方形ABCD中，AB=4，点E为CD上一动点，AE交BD于点F，过点F作FH⊥AE，交BC于H，过H作GH⊥BD于点G，下列结论：①AF=FH，②∠HAE=45°，③BD=$\frac{3}{2}$FG，④△CEH的周长为定值．其中正确的是①②④（写正确结论的序号）．