dogs telll the blind person when it is __________ to cross the road (safe)

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• Dog tell the blind person when it is ---- to cross the road. A save B safe C safely D safety 为什么
• dogs telll the blind person when it is __________ to cross the road (safe)
• Dogs help the blind people cross the road____(safe).
• A guide dog is a dog trained to guide a blind person .However ,all dogs are colour blind .in f____,to a dog ,being colour blind isn't harmful because it has a good sense of smell .Having a good sense of smell is more i___ to a dog then being able to see colours .But you may ask ,can it get a blind person across a road s____?Well ,dogs can be taught that they should stop when the top light ( the red light ) is lit ,and go when the b____ one ( the green
• Dogs help the blind people cross the road____(safe).
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