Our surrounding(周围) is being polluted faster than nature and man’s present efforts can’t prevent it. Time is bringing us more people, and more people will bring us more industry, more cars, la
Charles Dickens (1812-1870), the great nineteenth century English novelist, was born near Portsmouth. His father ran heavily into debt and when he was twelve, he had to go and work in a factory for
是平面上的三个点,直线
上有一点
,满足
,则
等于( )
B. 
C.
D.
∴
故选B.