According to the author, in which decade of the nineteenth century did a steamship first attempt to compete with the transatlantic packets（）
A. The twenties.
B. The thirties.
C. The forties.
D. The fifties.
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在Windows中输入英文时，中西文快速切换的组合键是( )。
Alt+Shift
B. Ctrl+空格键
Ctrl+Alt
D. Shift+空格键
69（）
A. path
B. course
C. road
D. way
What is described in the first paragraph（）
A. Entertainment in small towns.
B. Americans' adjustment to a moving society.
C. The life style of Americans in the past.
D. Personal relations in small communities.
工程单价的计算依据包括( )。
A. 材料价格
B. 预算定额
C. 项目建议书
D. 概算定额
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