在我国，实行农村村民自治和城市居民自治，是 ①人民当家作主最有效的途径 ②村民和

100mL 6mol•L^-1 H₂SO₄ 跟足量锌粉反应，在一定温度下，为了减缓反应进行的速率，但又不影响生成氢气的总量，可向反应物中加入适量的（　　）

A．碳酸钠固体

B．硝酸钠

C．硫酸钾固体

D．醋酸钠固体

I think that’s the only way we can think of ______ the math problem.

A．solve

B．solves

C．to solve

D．solving

变换坐标系有几种（）。

A、5

B、6

C、7

D、8

下列关于Windows 2000 Server的描述中，错误的是( )。

A．活动目录服务具有可扩展性和可调整性

B．基本管理单位是域，其中还可以划分逻辑单元

C．域控制器之间采用主从结构

D．域之间通过认证可以传递信任关系

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.

Which of the following was NOT a predecessor of baseball

A. Rounders.



B. Town ball.
C. Cricket.



D. One old cat.