单项选择题

What have the people probably been doing

A．Having a picnic.
B．Enjoying a concert.
C．Watching a picnic.
D．Eating out.
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单项选择题
What does the man mean
A．He watched the television program with his mother.
B．His mother told him his professor was on television.
C．Answering the phone caused him to miss the television program.
D．His mother missed the television program.
单项选择题
Why do dolphins use clicks
A．To communicate with other dolphins.
B．To recognize objects in the water.
C．To learn human language.
D．To express fear.
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