单项选择题

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

A．sea urchins
B．sea otters
C．the relationship of many sea living creatures in the kelp forest
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多项选择题
Why the current study statistics are more accurate than the past{$mediaurl}
A．Because the study range is wider.
B．Because the current equipment is more advanced.
C．Because of the devotion of the ocean explorers.
D．Because of the use of multi-disciplinary approach.
E．Because of people’s rising concern about the ocean exploration
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