阅读下列短文，按要求完成各题。

    Tony is from New York. His father has a store there. And his mother is a reporter. He's six years old now and begins to go to school this year. It's very near their shop and his father doesn't drive a car to take him to school. He walks to school early every day. So he's not late for class and his teachers like him.

    It's Tuesday today. Miss White is teaching them to count from one to ten. Tony is studying hard. Soon he can count them. Miss White is happy and asks, "How many people are there in your family, Tony?"

    Tony stands up and begin to count with his fingers, and then says, "Two, Miss White."

    "Who are they?"

    "My father and my mother."

    "Oh?" Miss White is surprised, "Two people in your family?"

    "Because now I'm not at home."

秦朝北筑长城，防备游牧民族的南下袭扰。当时，长城防御的主要少数民族是（　）

下列各组词语中，没有错别字的一组是   (　 　)