如图，在5×5正方形网格中，一条圆弧经过A，B，C三点，那么这条圆弧所在圆的圆心是（   ）

直线截圆所得劣弧所对的圆心角为（   ）

有学者说“我们正处在有史以来最大的转折关头……第一次全民一心一意地在瓦砾和血泊中奋争，以创造一个赫然在望的时代。”这位学者述说的历史事件应为（    ）

读短文，判断对错。
    Hello, everyone! My name is Kate. I come from France. Now I'm in China with my parents. I'm a student of No. 2 Middle School (第二中学). The teachers there are very friendly (友好的) to me. The students there are friendly, too. I like them very much. Look at that tall man! He's my father. He has big eyes and a big nose. He's handsome. He is a doctor. He often helps people in need. That beautiful woman is my mother. She has long hair and big blue eyes. She's a nurse. My parents and I all like China very much. The Chinese food is very yummy. The Spring Festival (春节) is coming. We will spend (度过) the Spring Festival in Beijing.

某历史兴趣小组的同学准备去实地探访古代丝绸之路，他们不应该去的省份是(     )