如果等差数列{an}中，a3+a4+a5=12，那么a1+a2+...+a7=A

Do you like T-shirts? Do you need hats in different colors? Now, boys and girls,come and look at Huaxing Clothes Store.

clothes	Color	price
sweater	white, blue, red, yellow	$12
T-shirt	black, green, orange, white	$9
trousers	red, black, blue	$8
socks	yellow, blue, white	$4
hat	orange, red, black	$6

根据短文内容选择正确答案：
小题1: If you like red and have only $ 7, you can buy       .

A．a sweater

B．a hat

C．a T-shirt

D．a bag

小题2: If Jack only has 20 dollars, he can buy           .

A．two sweaters	B．two T-shirts and a hat
C．a pair of trousers and a sweater	D．three pairs of socks and a T-shirt

小题3:In Huaxing Clothes Store people can buy         . 

A．orange sweaters

B．green hats

C．white trousers

D．blue socks

小题4: How much are three pairs of black trousers and an orange T-shirt?

A．$33.

B．$30.

C．$35.

D．$21.

小题5: They don’t have          hats.

A．orange

B．yellow

C．red

D．black