12. （ ）

(单选题)What is the effect of radiation on DNA? (单选题)When did the vegetation in the most radioactive areas of the (单选题)Which is correct according to the passage? (单选题)When people hear the name of Chernobyl, what do they usually (单选题)How would you describe Jenny according to this passage? (单选题)Why did Jenny’s mother ask Jenny to do some chores? (单选题)What is the name of Jenny’s favorite doll? (单选题)How much is Jenny’s work in terms of paying off the pearl ne (单选题)Which statement is NOT correct? (单选题)（ ）