A:23
B:20
C:21
D:19
山下小百合, ____是姓,____ 是名字。日本人的许多姓是从____演变过来的。
Hello,friends! My name is Jack.I am a Chinese boy.My favourite food is chicken.I like beef noodles,too.I don't like fish but egg is OK.Potatoes are my favourite vegetable.My favourite fruit is bananas.They are so sweet.
已知15=1A+1B,A,B是非0不相同的自然数,A+B的最小值是( )