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Which of the following statements best expresses the main idea of the passage?A.Glass is v
Which of the following statements best expresses the main idea of the passage?
A.Glass is very useful because it has many unusual qualities.
B.Light signals have changed the use of glass in industry.
C.Glass fibers have reduced the cost of telephone communication.
D.The use of glass fibers to carry telephone messages is an interesting new development.
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