如果2（x+3）的值与3（1-x）的值互为相反数，求x的值。
解：依题意得，2（x+3）+3（1-x）=0
解方程，得x=9
所以，x的值为9。
On stepping into the room this morning, I was astonished to find the floor covered with _______ looked like tiny insects.
A．that
B．what
C．where
D．when
干扰沉降是指颗粒在无限空间介质中的沉降。
