How does the narrator change at the end of the story “a decade”?

Later, when Zhu Wenli makes the mistake of admitting that the Russian Revisionists and American Imperialists are still human (despite Mao's assertion that they are dirt), she is sent to labor camp to atone for her capitalist 'sins.' Once again, Zhu would not have gotten into trouble if her students had not reported on her, this time to the Workers' Propaganda Team.

it translates into:

read the letter of your pen pal. write and answer 3 questions.

the answer is b. the tracer looks harmless in flight, but the pilot’s bitten lips and white knuckles suggest how dangerous it can be.