单项选择题

A．Stay inside.
B．Join the man.
C．Do some experiments.
D．Write some letters.
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问答题
1. 现代社会竞争与合作同时存在2. 解释原因3. 你的观点Cooperation and Competition
单项选择题
A．In the early part of the 19th century.B．In the last part of the 19th century.C．In the 20th century.D．In the beginning of the 20th century.
A．In the early part of the 19th century.
B．In the last part of the 19th century.
C．In the 20th century.
D．In the beginning of the 20th century.
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