题目

In 1999, Rebecca Constantino began doing a study at schools across Los Angeles. She had just completed a Ph. D. in language and learning, and she was analyzing children’s access to ________ in rich and low-income communities.One day, she ________ something that stopped her in her tracks. “I was at a ________ in a wealthy community, and they were ________ almost brand-new books because they didn’t have ________ in the library,” Constantino said. She put the books in her car and drove them to a school in a(n) ________ community.Shocked by the ________ she saw in public school libraries, 在○里填上“＞”“＜”或“＝”。3吨60千克○3.6吨　　　　　 8平方米○790平方分米4.9元○4.90元　　　　　　　4千米50米○4.05千米