阅读下面这篇短文，短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第2—5段每段选择1个正确的小标题；(2)第27～30题要求从所给的6个选项中选择4个正确选项，分别完成每个句子。
Trade Unions 1. Some scholars have associated
trade unions with the medieval craft guilds(中世纪的行会), but there are important
differences between the two. The guild members were master craftsmen who owned
capital and often employed workers. Unions are known as associations of workers
with similar skills. 2. In the past, individual workers had no
control over the conditions of their working lives; political and economic
power was concentrated in the hands of wealthy business owners. Workers found,
however, that there was strength in uniting. From their earliest years, union
objectives have been higher wages and improved working conditions.
3. Employers resisted, of course. They made great efforts to stop union
organizing its activities. Union members were fired, workers were forced to sign
contracts in which they promised not to join a union, and companies hired
strikebreakers (破坏罢工者) and even gunmen to frighten organizers.
4. One of the earliest successful labor organizations in the United States
was the Knights of Labor, founded in 1869. The Knights, which included both
skilled and unskilled workers, attempted to organize all workers into one great
union. Alter it successfully struck the Wabash railroad owned by Jay Gould in
1885, its popularity and power grew dramatically. In 1886 the Knights had
700,000 members. 5. The decline of the Knights of Labor,
however, came quickly. The strike against Gould was gradually broken, and the
Knights’ radical positions on social issues cost them public support. In the
end, a lack of unity as well as the rapid inflow of unskilled immigrants
weakened the union’s economic power, and the organization came to an end. Paragraph 2 ______