英语高手请进!真题阅读（2001）2,谢谢解答!

英语高手请进!真题阅读（2001）2,谢谢解答!
首先在这里先说明一下情况,因为我的错题是考试的历年真题来的.同时这次的考试对我来说很重要,希望各位前辈能够帮助我,谨慎作答,因为我会完全相信你们的答案的!谢谢!（题目比较多,如果越详细,解释越明白.我会最后提高财富值的）谢谢!同时我希望您能教我怎么可以做阅读理解拿高分.有些时候我做错是因为我看不懂某句说什么意思呢.谢谢.
Passage I
Today,supermarkets are found in almostevery large city in the world.But the first supermarket was opened only fiftyyears ago.It was opened in New York by a man named Michael Cullen.
A supermarket is different from othertypes of stores in several ways.In supermarkets,goods are placed on openshelves.The customers choose what they want and take them to the check-outcounter.This means that fewer employees are required than in other stores.
The way products are displayed is another differencebetween supermarkets and many other types of stores.For example,in supermarketsthere is usually a display of small inexpensive items just in front of thecheck-out counter:candies,chocolate,magazines,cheap books and so on.Why arethey there?
请问为什么第一题选A
我选了D,bit不是很小的意思吗?只回答这题就行了,谢谢