下列关于排放含病原体的污水的说法，符合《水污染防治法》的是（）。

A．须在离水源保护区30公里外的水体内排放

B．必须经过消毒处理，符合国家有关标准后，方可排放

C．需先经当地环境保护行政主管部门及水资源管理部门同意

D．禁止向水体排放含病原体的污水

There has been much speculation about the origin of baseball. In 1907 a special commission decided that the modern game was invented by Abner Doubleday in 1839. One hundred years later the National Baseball Museum was opened to honor Doubleday. Historians, however, disagree about the origin of baseball. Some say that baseball comes from bat-and-ball games of ancient times. It is a matter of record that in the 1700s English boys played a game they called "baseball". Americans have played a kind of baseball since about 1800. At first tile American game had different rules and different names in various parts of the country — "town ball". "rounders", or "one old cat". Youngsters today still play some of these simplified forms of the game.
Baseball did not receive a standard set of rules until 1845, when Alexander Cartwright organized the Knicker-bocker Baseball Club of New York City. The rules Cartwright set up for his nine-player team were widely adopted by other clubs and formed the basis of modem baseball. The game was played on a "diamond" infield with the bases 90 feet apart. The first team to score 21 runs was declared the winner. By 1858 the National Association of Baseball Players was formed with 25 amateur teams. The Cincinnati Red Stockings began to pay players in 1869.

Who first gave baseball a standard set of rules’

A. Abner Doubleday.


B. Alexander Cartwfight.
C. Albert Spalding.


D. Babe Ruth.