You can find language pollution whenever you open a newspaper, turn on your TV set, listen to a popular song or look at different kinds of advertisements. Language pollution exists almost everywher
As an adult, he must work _______________ to earn _________ to support his family. A. hardly enough; enough money B. enough hard; enough money C. hard enough ; money enough D.
＝(1，－2)，
＝(a，－1)，
＝(－b,0)，a＞0，b＞0，O为坐标原点，若A，B，C三点共线，则
＋
的最小值是________．