Guinea pigs are intelligent and quiet animals. They may develop a close bond with you and may reward you with chirps, purrs, squ

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问题     Guinea pigs are intelligent and quiet animals. They may develop a close bond with you and may reward you with chirps, purrs, squeaks or whistles. Guinea pigs do not【B1】________very much if you do not spend much time with them. However, if you spend time with them, they will become more responsive towards you.
    Guinea pigs are very active and they enjoy running through【B2】________ (tunnel) and mazes. If you give them a toy, they will play with it.【B3】________you have more than one guinea pig, you may observe that they like to play games of chase with each other. Guinea pigs are social animals. They like to interact with others.
    However, be【B4】________ (carefully) not to overcrowd their homes. This is because it is very stressful for them and they may attack each other. Do not change their food or environment as they do not like changes.
    So still interested in having a guinea pig as a pet? Just remember to【B5】________note of the above points.
【B2】

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答案tunnels

解析 根据下文的迷宫用了复数形式,因此此处的洞穴应该也用复数形式,故应填tunnels。
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