A、One dozen. B、Two dozen. C、Three dozen. D、Four dozen. A关键听懂女士的话：通常我要两打，但现在我减了一半。因此她现在只需一打了。故选A。此处尤其要明白cut...down to half的含义为减至一

W: I need to catch the bus and it leaves at 10: 50.
M: Then, you’d better hurry. It’s already 10: 40.
Q: What should the woman do?

W: How many dozens of eggs do you need today?
M: Regularly I took two dozen but now I cut it down to half.
Q: How many eggs does the woman need now?