Nowadays, there are lots of left-behind children（留守儿童）at school, especially in the ____（贫穷）areas in China. According to report, China has 61.03 ____（million）children who have been left behind by their families. ____（lack）proper care, many of these children suffer from anxiety（焦虑）and ____（事故）.

    Some of left-behind children have ____（not see）their parents for more than a year. Some of them live with their grandparents or relatives. They feel ____（孤独）and miss their parents a lot. Every child needs ____ （parents）love and care.

    Zhi Yan, a 10-year-old girl, lives in a mountain village in ____ （west）China. She has to prepare supper for her family ____（除了）study. “Thanks to schools, governments and society's help, we live ____（happy）.” The girl said.

读课文《黄帝》，根据意思写词语

①图谋，打算。____

②征伐，出兵攻打。____

给下面的句子，换一种说法。

孩子，难道你能一辈子依赖我们吗？

____

如图，为了测量河宽，在河的一边沿岸边选取B、C两点，在对岸岸边选择点A．测得∠B=45°，∠C=60°，BC=30米．求这条河的宽度（这里指点A到直线BC的距离）．（结果精确到1米，参考数据$\sqrt{2}$≈1.4，$\sqrt{3}$≈1.7）