在反比例函数y=$\frac{1-3m}{x}$的图象上有两点A（x₁，y₂）、B（x₂，y₂），当x₁＜0＜x₂时，有y₁＜y₂，则m的取值范围是(      )

已知：2KClO₃ $\underset{\_}{\underset{\_}{Mn{O}_2}}$  2KCl + 3O₂↑。下图表示一定质量的KClO₃ 和MnO₂固体混合物在受热过程中各物质质量随时间的变化趋势。下列说法不正确的是（   ）

— What do you think of that restaurant?

— I          go there, because the food there is very expensive.

阅读短文，判断下列句子是否正确。
    Ann went to Qingdao with her friends on her holiday. They went there by train. They went to the beautiful beach. The weather was sunny and hot. So they had great fun playing in the water.They ate lots of fresh fish for lunch. In the afternoon, they rode bikes. Jack fell off his bike and hurt his leg. So Jack stayed at the hotel and watched TV. On the second day, Ann took many pictures of the sea. And she bought some gifts for her parents. Anyway, they had a good time.

某校150名学生参加竞赛，平均分为55分，其中及格学生平均分为77分，不及格学生平均分为47分，则不及格学生的人数为（　　）