完形填空。阅读下面短文，掌握其大意，然后从各题所给的A、B、C和D项中，选出最佳选项。
One afternoon, my son Adam asked me, “Are all people the same even if they are different in color?”
I thought for a minute, and then I said, “I’ll explain, 1 you can just wait until we make a quick 2 at the grocery store. I have something 3 to show you. ”At grocery store, we 4 some apples --- red, green and yellow ones.
