F: What are the pupils doing there? They're picking up the plastic bags on the street, but the plastic bags are so dirty. ,M: They are doing that to remind people to protect the environment. You know, the white pollution is so serious these years. ,F: Of course I know, but the pupils are young and there must be some viruses which are bad for them. Our hospital has many children falling sick because they pay a little attention to cleaning.
(A) M: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that? (B) M: Yes, you are right! Viruses can be dangerous to young pupils sometimes! (C) M: Don't worry. They got plenty fo time to finish their homework after picking up all the bottles. (D) M: But I don't think the required number is a problem for the teachers who are picking plastic bags.
B