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 in an interesting new development.

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单项选择题

Why did Lincoln added in the letter written for your son by Abraham Lincoln because he wanted ______.

A．to let the mother remember him
B．people to know he was the president
C．to show his thanks and kindness to the mother
D．to encourage the young soldier

单项选择题

Why did Elizabeth say to her father But, Dad, you can't be healthy if you are dead.

A．He was driving at great speed.
B．He was running across the street.
C．He didn't have his safety belt on.
D．He didn't take his medicine on time.