What is the author's tone in this passage?

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The questions below are based on the following passage. Helen Keller was born on June 27, 1880. She was a happy and healthy child until the age of 19 months when she fell ill with a terrible fever. Although Helen recovered from the fever, it left her both deaf and blind. Helen was loved and cared for by her doting parents, but her behavior became erratic after she lost her hearing and sight, with unpredictable outbursts of temper. Her parents were at a loss how to reach her and teach her how to behave. Helen herself was frustrated and lonely in her dark, silent world. All of that began to... Show more

What is the author's tone in this passage?