单项选择题

Listen to the statement and circle the appropriate letter. What is the topic of this statement

A．the impact of human activities on environment
B．the impact that a species’ extinction has on others
C．species conservation
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单项选择题
From the passage, we can conclude that when the number of sea otter rises, the number of sea urchins will __________ .
A．fall
B．rise
C．remain the same
填空题
__________ now prey on sea otters rather than their traditional preys.
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