听下面一段独白，回答以下小题。1.
2.
3.
| A．Dogs respond to calls like humans. |
| B．Dogs and humans had a different ancestor |
| C．Dogs used to have a more complex brain system. |
| D．Dogs and humans make sounds in a similar way. |
| A．22 dogs in all were involved in the experiment. |
| B．The dogs were all awake while they were being scanned. |
| C．The dogs were as sensitive to human sounds as to dog sounds. |
| D．The dogs listened to as many human noises as dog noises. |
| A．It may not have anything to do with evolution. |
| B．It provides evidence for dogs’ attachment to humans. |
| C．It proves that dogs have a sharp sense of sound. |
| D．It may not be supported by other experiments. |
更新时间：2024-05-04 19:24:57
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