填空题

Listen to the statement and complete the following sentences with NO MORE THAN TWO WORDS. The natives can harvest sea otters __________ during the year with a limited number.

【参考答案】

any time
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填空题
The number of seal or sea lion declines due to the __________ .
单项选择题
This ecological balance among sea urchins, sea otters, and kelps became __________ during the nineteenth century.
A．upset
B．satisfactory
C．neutral
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