⑴____A. shop B. stop C. no
⑵____A. can B. cake C. sad
⑶____A. Thursday B. hurt C. nurse
⑷____A. time B. bike C. kite
⑸____A. bus B. us C. put
如图所示的长方体中,AB=2 6 ,AD= 5 , CC1 = 23 ,E、F分别为 AA1,A1B1 的中点,则异面直线DE、BF所成角的大小为( )