F: Our guest today is Dr. Lia Kwan. Dr. Kwan works with computer related injuries and problems. Dr. Kwan, do you see more computer-related problem these days? ,M: Oh, definitely yes. People are doing more and more with computers and that means more physical problems. ,F: So what can we do? ,M: Well, how you sit at the computer is very important. First, have a good chair. It should support your back well. ,F: OK, a good chair. ,M: And also your feet should be flat on the floor when you're sitting. You shouldn't cross your legs. ,F: OK. I don't always keep my feet flat on the floor at the computer. ,M: I know, it's hard sometimes. Anyway, you shouldn't sit too close to the screen either. ,F: Is half a meter away enough? ,M: Not exactly. You should sit about an arm's length away.
(A) F: But need we have good chairs? You don't suggest yet. (B) F: Why don't suggest us if we should keep our feet flat on the floor. (C) F: I didn’t hear you. Please could you tell me again? (D) F: Ok, I will remember that not only good chairs doesn't be suggest but also the crossing our legs.
C