A、Once a few weeks. B、Every month. C、Seldom. D、Every summer. B

M: Miss Smith, I told Dr. Brown that I would call him in the Houston office at ten 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 two hours earlier in Houston, Sir. I know without looking it up because my sister lives there.
Q: When should the man place his call to Houston?

W: It is certainly good to hear your voice. When are you coming for a visit?
M: Not for a few months, I’m afraid, Mom. But I hope we can come for a few weeks this summer, probably in June.
Q: How often does the man visit his Mom?