【单选题】The polar bear got nearer to the seal by ______.
A．sliding over the ice sheet
B．tiptoeing on the ice sheet
C．swimming under the ice sheet
D．crawling from behind the seal
【单选题】The polar bear got nearer to the seal by ______.
A．sliding over the ice sheet
B．tiptoeing on the ice sheet
C．swimming under the ice sheet
D．crawling from behind the seal
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