A:So selfless and warmhearted the young couple were
B:So selfless and warmhearted were the young couple
C:How selfless and warmhearted the young couple were
D:The young couple were such selfless and warmhearted
①鸟兽昆虫的窝____
②晴朗无云____
③耸立____
④形容女子打扮十分艳丽____
如图,长方体ABCD-A1B1C1D1中,AA1=AB=2,AD=1,点E,F,G分别是DD1,AB,CC1的中点,则异面直线A1E与GF所成的角是 ( )