As civilization __________，more and more people have realized the importance of preserving rare animals from dying out.
| A．stretches |
| B．spreads |
| C．extends |
| D．expands |
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As civilization __________，more and more people have realized the importance of preserving rare animals from dying out.
| A．stretches |
| B．spreads |
| C．extends |
| D．expands |
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