单项选择题

The dolphin leapt into the air because ______.

A．Sagan had turned his hack
B．it was part of the game they were playing
C．he wanted Sagan to scratch him again
D．Sagan wanted him to do this
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单项选择题
When Sagan told the director about what the dolphin had done, the director ______.
A．didn't seem to think it was unusual
B．thought Sagan was joking
C．told Sagan about other words the dolphin knew
D．asked him if he knew other words
单项选择题
The man who never tries anything new is a(n) ______ on the wheels of progress.
A．obstacle
B．brake
C．break
D．block
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