填空题

The so called "virtual reality" mentioned in the second sentence of the passage is actually ______.

【参考答案】

a computer system used to produce life like illusions
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pollution
单项选择题
A．People marry at a much later time.B．More birth control devices and methods have been used.C．Women would rather go to study or work than have children.D．All of the above.
A．People marry at a much later time.
B．More birth control devices and methods have been used.
C．Women would rather go to study or work than have children.
D．All of the above.
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