——More and more students wear glasses in our school these days.——I agree with you. Students ___ keep on doing eye exercises to protect their eyes.

关于家庭电路，下列说法正确的是（）

Here are some traditional clothes from India.

下图所示的四幅图，分别表示我国南疆的棉花、松嫩平原的甜菜、五台山一带的垂直农业、美国的农业区域专业化生产的主导区位因素。下列排序正确的是（   ）