单项选择题

第一节 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 What is important for them to do

A． Carry out instructions.
B． Experience.
C． Practice together.
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单项选择题
According to the passage, people started to make glass ______.
A．4,500 years ago
B．nearly 4,500 years ago
C．less than 4,500 years ago
D．no less than 4,500 years ago
单项选择题
According to the passage the new telephone communication system ______.
A．has been put into actual use
B．was put into actual use in 1977
C．was put on experiment in 1977
D．had been repeatedly experimented on before 1977
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