-Your paintings are so great, David! When did you learn to paint?
-Three years ___________.
A：ago
B：before
C：after
D：later
①体表被覆羽毛 ②前肢变为翼 ③体内有气囊
④胎生、哺乳 ⑤体温恒定 ⑥体内无脊柱
Here's a shopping receipt(收据) of Linda.
Jiulong Great World
18 Huanghe North Road
Suqian City,223800
13/04/2012 15:17PM
Number Item(物品) Product# Price
1 Pair of trousers 3597981144 ¥ 150.00
3 Pairs of socks 8294653379 ¥ 10.00/each
1 Sweater 3607889911 ¥ 375.00
Total ¥ 555.00
WELCOME NEXT TIME!
根据以上内容，选择正确答案。
