单项选择题


Questions 15-18 are based on the following dialogue:
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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单项选择题
How many total courses must a student take for a literature major
A．Three.
B．Five.
C．Eight.
D．Ten.
单项选择题
What do we know about Bethune from the passage
A．She was born and raised in New York City and never left ever since.
B．She was 34 when she started the program called Infinite Dreams.
C．She was trained at a very early age, and the training and practice last long.
D．She went through a host of medical problems at the age 6.
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