Parents should keep an eye on little children all the time, they can easily get hurt.

A.or B.and C.but D.so

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AI（人工智能）products are not new. However, researchers have been working to improve the technology. Now virtual（虛擬的）assistants, like Siri and Alexa, can have short conversations with us. AlphaGo taught itself to play Go and became better than the top human players.

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