A、3 hours. B、4 hours. C、5 hours. D、6 hours. C

M: I think twice about taking a history class next year. There’s not a single good professor in the whole history department.
W: Look, that’s what you said last semester about the sociology department, and I’m very glad I didn’t pay any attention to What you said.
Q: What does the woman mean?

M: When shall we start our work, Cindy?
W: Tomorrow at 10 o’clock. But we must work quickly, for we have to finish everything before 3 in the afternoon.
Q: For how long can they work?