单项选择题

A．Satisfied.
B．Interested.
C．Tired.
D．Discouraged.
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单项选择题
A．Because whales keep a balance between plants and animals on land.B．Because whales eat a lot of fish.C．Because whales eat large amounts of garbage.D．Because whales keep oceans clean for fish, and people need fish.
A．Because whales keep a balance between plants and animals on land.
B．Because whales eat a lot of fish.
C．Because whales eat large amounts of garbage.
D．Because whales keep oceans clean for fish, and people need fish.
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