A、At ll’clock. B、At 4 o’clock. C、At 7 o’clock. D、At 2 o’clock. C这道题是一个时差题，关键在于考生要明白"earlier"一词的含义。当巴黎时间是11点时，说话人所在地的时间是7点，这样才是"T

M: You see,a marine biologist is now appearing on the screen.
W: Yeah.We are now being taken on a tour familiarizing with life in the salty depths.It’s an interesting tele teaching lesson.
Q: What are the man and woman doing?

M: Miss Green, I told Dr. Smith that I would call him in the Paris office at 11 o’clock their time. Please find out the time difference for me so that I’ll know when to place the call.
W: It’s 4 hours earlier in Paris, sir.
Q: When should the man place his call to Paris?