《纳税钱》是文艺复兴早期佛罗伦萨画家（）的作品。 A.马萨乔 B.乔托 C.波提切利

某兴趣小组的同学设置了“有光”和“无光”两种环境条件，探究“光对大豆发芽的影响”。这种研究方法属于

A．观察法

B．分类法

C．调查法

D．实验法

强心苷引起的心动过缓可选用（）

A.氨茶碱

B.氯化钾

C.阿托品

D.呋塞米

CIF要求卖方为货物出口报关,不适用海运及内河。

不同型号的千斤顶可以混用，但必须保证不超载。（）

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 is true about the origins of baseball

A. Historians agree that baseball was invented by Abner Doubleday.
B. Baseball, as played in the early 19th century, differed very little from today’s game.
C. As early as the 1700s, English boys played a game called "baseball".
D. The first standard set of baseball rules was established at the turn of the century