单项选择题

One of the extraordinary qualities of glass is that it can carry ______.

A．light signals
B．sound signals
C．electric signals
D．any signals
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单项选择题
Which statement can be the main idea of the passage
A．Glass is very useful because it has unusual qualities.
B．Light signals have changed the use of glass in industry.
C．Glass fibres have reduced the cost of telephone communication.
D．The use of glass fibres to carry telephone messages is an interesting new development.
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 3,ears ago
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