The death rate is __________ pigs and recovery usually __________ within 7—10 days.
| A．low in; occurs |
| B．rich in; happens |
| C．high in; came about |
| D．poor in; took place |
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The death rate is __________ pigs and recovery usually __________ within 7—10 days.
| A．low in; occurs |
| B．rich in; happens |
| C．high in; came about |
| D．poor in; took place |
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