单项选择题

A．To practice more on volleyball.
B．To have good rest after practice.
C．To eat more healthily.
D．To focus on her study.
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单项选择题
The researcher mentioned in the third paragraph was fired because______.
A．she worked for the rival of the company
B．she failed to keep her research results secret
C．she was obliged to keep her discoveries secret
D．she was committed to a contract with a company
单项选择题
According to Leo Hickey of Yale University, which of the following may have spawned more advanced species of land animals
A．The barren ocean floor.
B．The Arctic.
C．The rain forest.
D．Temperate Zones.
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