题文
Because of global warming, the ice that polar bears depend on for survival _______.
| A．are slowing disappearing | B．is slowly disappearing |
| C．are slowly disappeared | D．have slowly disappeared |
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Because of global warming, the ice that polar bears depend on for survival _______.
| A．are slowing disappearing | B．is slowly disappearing |
| C．are slowly disappeared | D．have slowly disappeared |
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