What is the difference between acute and chronic radiation poisoning?

Acute radiation poisoning will be in the first 24 hours and sometimes even within the next 48 hours. Chronic radiation poisoning is often classified as something that is an affect ongoing for months. 

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.