—I am very ____ tomorrow's Math test . I am afraid I can't pass this time.
—Cheer up! I'm sure you'll make it.
A：worry
B：worry about
C：worried about
D：worried
定义min{a，b}=a,a≤bb,b≤a，设函数f（x）=min{2x，|x﹣2|}，若动直线y=m与函数y=f（x）的图象有三个交点，它们的横坐标分别为x1，x2，x3，则x1+x2+x3的取值范围为____
以下现象是自然界常见的物态变化，在其物态变化过程中吸热的是（ ）
