科研之友
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<正>There are many wonders (奇迹)in the world. They’re amazing (神奇的).Nature (大自然)makes many wonders. People make wonders,too! Let’s start from the Great Wall of our country.Who built it?谁修建的长城?About 2, 000 years ago, there were seven smaller countries in China. There were often wars (战争). People huilt big walls to keep enemies (敌人)out of their
