单项选择题

Why does the speaker tell the story about Newton

A．To illustrate what a great scientist he was.
B．To explain why lab equipment must be cleaned carefully.
C．To emphasize the need for proper precautions.
D．To show how theoretical chemistry has advanced.
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单项选择题
What does the passage tell us about gun-dogs
A．They are the fastest runners of all dogs.
B．Their teeth are removed when they are young.
C．They can carry birds, etc, without hurting them.
D．They breed well, producing many young dogs.
单项选择题
What are they doing at the airport
A．They are traveling together.
B．They are having a walk.
C．They are saying goodbye to each other.
D．They are chatting.
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