10.B〖解析】如图,取D1D的中点F,连接A1F,EF,则EF∥BD1,∴∠A1EF即为异面直线A1E与BD1所成的角.设正方体ABCDA1B1C1D1的棱长为2,则在Rt△A1AE中,A1A=2,AE=√2,∴A1E=√A1A2+AE=√6.在Rt△DEF中,EF=√DE+DF=√(2)2+12=3.在Rt△A1DF中,A1F=√A1D2+D1F=√22+1=5.在△A1EF中,由余弦定理的推论得A,E+EFZ-A,Fcos∠A1EF2A1E·EF6)2+(3)2-(5)2,故选B2√6×√3DAC

第四部分第二节Iwo davs before my birthday last vear. Dad came home earlv. As usual. Ihelped him carry his bags into his study: When I turned to leave. he said: "Hey. wouldyou like to help me clean my comb? It's been a while since I last cleaned"It hit methen why. as a child. helping my dad clean his comb was such a joy. That routinemeant that my dad was home early to spend the evening with Mum and I. It meantwould watch TV with us or play a few video games with me. It meant a happyloving familyI pass the clean comb back to Dad. I noticed the wrinkles next to his eyes.They are more noticeable when he smiles. but his smile is still as heartw arming asbefore. The smile of a father who just wants a good life for his family. Dad carefullyplaces his comb on top of his wallet. After so many years. he still organises hispersonal items in the same careful way. I guess some things never change. And forthat. I'm glad

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