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What has happened to Spark?He has just_________ .

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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.

1. It’s important to be aware ________ some basic online security measures.

A. in
B. by
C. at
D. of