What is the lecture mainly about？
A. Provisions of the Homestead Act
B. How to construct a log cabin
C. Frontier homes in the West
D. Early construction materials
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According to paragraph 6, what was the result of adding a second and a third actor？
A. Playwrights were able to act in their own plays.
B. The audience could understand the story more easily.
C. The action could take place in more than one scene.
D. The actors became more important than the chorus.
The phrase Still others in paragraph 3 refers to
A. students from New York University
B. eighth-floor workers
C. ninth-floor workers
D. routes of escape
A．dyingB．diedC．deadD．death
A. dying
B. died
C. dead
D. death
当代科技革命使社会经济结构发生了深刻变化，表现在()。
A. 卡特尔、辛迪加和托拉斯开始形成
B. 直接物质生产部门在国民经济中的比重下降
C. 劳动密集型产业大幅度增加
D. 社会分裂为两大对立阶级
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