Because of climate change, the ice that polar bears depend on for survival .
| A．are slowly disappearing |
| B．is slowly disappearing |
| C．are slowly disappeared |
| D．have slowly disappeared |
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Because of climate change, the ice that polar bears depend on for survival .
| A．are slowly disappearing |
| B．is slowly disappearing |
| C．are slowly disappeared |
| D．have slowly disappeared |
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