1, D 2, a 3,3 and 24,23 5,2: 2:1

Ability display:

1，A

2,

Suppose: the price of T-shirt is X, and the price of mineral water is Y.

Understand:

2X+2Y=44

X+3Y=26

Multiply the second equation by 2 to get:

2X+6Y=52 2X=52-6Y

By introducing the first equation, we can get:

52-6Y+2Y=44 Y=2

X=20