如图甲、乙、丙、丁表示四株豌豆体细胞中的控制种子的圆粒与皱粒（Y、y）及黄色与绿色（R、r）两对基因及其在染色体上的位置，下列分析正确的是（    ）

PM2.5是指大气中直径小于或等于2.5微米的颗粒物，也叫可入肺颗粒物，与肺癌、哮喘等疾病的发生密切相关，是雾霾天气的主要原因，它主要来自石化燃料的燃烧等，下列与PM2.5相关的说法不正确的是（　　）

将一个电动传感器接到计算机上，就可以测量快速变化的力，用这种方法测得的某单摆摆动时悬线上拉力的大小随时间变化的曲线如图所示。某同学由此图线提供的信息做出了下列判断  （     ）

① s 时摆球正经过最低点。
② s 时摆球正经过最低点。
③ 摆球摆动过程中机械能减少。
④ 摆球摆动的周期是 T＝1.4s。
上述判断中，正确的是

下列实验基本操作中，正确的是（　　）

阅读短文，判断下面的句子是否与短文相符    Hello, friends! I am Bob. It's Monday today. I was very busy yesterday. In the morning, I got up early and had a math class. After math class, I went to the library and read books. I like to read books there. It's 12 0'clock, I went home by bus. I had lunch with my family. In the afternoon, I did my homework. When I finished it, it was too late. I was very tired and I went to bed late.