阅读下面材料，然后从各题所给的四个选项中选出一个最佳选项
Here's a shopping receipt (收据) of Linda.
Jiulong Great World 118 Tongguan North Road Lianyungang, 222000
13/04/2016 15:17 PM
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
WELCOME NEXT TIME!
右图中曲线a、b表示物质跨（穿）膜运输的两种方式，下列表述正确的是
