Although metals ________widely in qualities such as strength and hardness，they all have certain qualities in________.
| A．vary；general | B．differ；common |
| C．react；particular | D．refer；detail |
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Although metals ________widely in qualities such as strength and hardness，they all have certain qualities in________.
| A．vary；general | B．differ；common |
| C．react；particular | D．refer；detail |
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