对下列物质在氧气中燃烧的实验现象描述正确的是（　　）

    It's Sunday morning. There are many people in the park, some boys are playing basketball. There are some girls under a big tree. They're singing and dancing. What are those women doing? They are drinking tea. Look at the woman in a blue coat. Who's she? She's my mother. She is talking to Edward. Edward is her student. He is a good student. He studies hard. He's good at all the subjects. And he's friendly to all his teachers and his friends.

当前各级各地吹响了全面脱贫攻坚的冲锋号，***在九江、恩施调研时强调，我国集中连片特困地区基本在中西部山区，这些地区人口超过2亿，脱贫致富是全面建成小康社会的大难点。从辩证法角度看，材料启示我们做好扶贫工作必须（    ）