单项选择题

Listen to the statement and circle the appropriate letter. What is the trend of the kelp forest in the future

A．increasing
B．declining
C．keeping balance
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单项选择题
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
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
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