I am John. I always get up late at the weekend. At about 9:30 am, I have breakfast. After breakfast, I start doing my homework. We have lunch at about 12:00, and then I watch TV or have a rest. I like reading and I often read some interesting books in the afternoon. I like sports, too. Sometimes I play football or basketball with my friends at school. My school is near my home, so I can walk there. Every weekend, my father takes me to a restaurant for a big dinner. I can enjoy lots of nice food. I like my weekend.

如图为元素X的某粒子的结构示意图，下列说法正确的是（　　）

①限制袁世凯的权力 ②防止袁世凯独裁 ③维护共和制度 ④实现民族解放

下列句子没有错别字的一项是（    ）

8708900精确到万位是（　　　）.