单项选择题

Which of the following best describes sea otters' relationship with kelp forests according to the passage

A．The kelp serves as food for the otter.
B．The otters protect the kelp by eating animals that destroy it.
C．The otters eliminate the kelp's source of nutrients.
D．The kelp is destroyed when the otters build shelters.
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单项选择题
It can be inferred from the passage that, if a large male sea otter weighs 100 pounds, it must eat approximately ______ of food a day to maintain its body heat.
A．5 pounds
B．15 pounds
C．30 pounds
D．60 pounds
单项选择题
Why are scientists concerned about the population of California sea otters according to the passage
A．It has been growing at too fast a rate.
B．Its growth rate has been steadily decreasing.
C．Its growth rate is not as fast as that of the Alaska sea otters.
D．It has been greatly reduced by oil spills and other forms of pollution.
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