若x=﹣2，y=12，则y（x+y）+（x+y）（x﹣y）﹣x2的值等于（ ）
——You have a beautiful voice. I love your songs.
——___________
制作临时装片的步骤一般是①染色 ②撕取实验材料 ③擦拭载玻片和盖玻片 ④在载玻片中央滴清水 ⑤盖盖玻片 ⑥将实验材料置于水滴中展开
-You look so worried, what’s wrong?
-More and more people like me begin to worry about the ______ pollution after the haze (雾霾) appeared in Beijing and some other cities in China.
