规定一种新的运算x⊗y=xy+x-y,则2⊗3等于( )
A.6
B.5
C.8
D.11
∵x⊗y=xy+x-y,
∴2⊗3
=2×3+2-3
=6+2-3
=5.
故选B.
There students in our school at that time.
A.were two thousands
B.are two thousand
C.are two thousand of
D.were two thousand
某人患神经炎、脚气病是缺乏什么物质所致
A.维生素B1
B.维生素A
C.维生素C
D.维生素D