题目内容
Who is Spark?Spark is a____________.
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What has happened to Spark?He has just_________ .
If you want to have Spark back, what can probably help you?A________________________ called cloning can probably help.
For many years, what have scientists been cloning?Scientists have been cloning all kinds of____________ for years.
What are some of the common problems for cloned animals?Cloned animals tend to have serious ___________________ and shorter life.
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