①Si﹣光导维纤②Na₂CO₃﹣制玻璃③Fe₂O₃﹣红色油漆或涂料④Al₂O₃﹣耐火材料⑤NaClO﹣消毒剂⑥NaCl﹣制纯碱  ⑦石灰石﹣陶瓷   ⑧无水硫酸铜﹣干燥剂．

下列大洲中，赤道、南回归线和北回归线都穿过的是（　　）

看图列式计算．

（Ⅰ）若直线l与直线m：3x+y﹣1=0垂直，求直线l的一般式方程；

（Ⅱ）写出（Ⅰ）中直线l的截距式方程，并求直线l与坐标轴围成的三角形的面积．

A：Hey, Dad! Are you outside?

B：Yes, I am．

A：What's the____like outside?

B：It's____．

A：What are you doing?

B：I'm playing soccer with your dog．

A：That's not____．

B：Sure! Well, it's time for you to call your grandma．

A：Yes．I'm calling Grandma____．But Grandma also wants to speak to you．

B：I see．I'm____right now．