18. (A)와 (B)에 들어갈 말로 가장 적절한 것은?

Duration shares an inverse relationship with frequency. If you see a friend frequently, then the duration of the encounter will be shorter. Conversely, if you don’t see your friend very often, the duration of your visit will typically increase significantly. 
(A), if you see a friend every day, the duration of your visits can be low because you can keep up with what’s going on as events unfold. If, however, you only see your friend twice a year, the duration of your visits will be greater. Think back to a time when you had dinner in a restaurant with a friend you hadn’t seen for a long period of time. You probably spent several hours catching up on each other’s lives. The duration of the same dinner would be considerably shorter if you saw the person on a regular basis. 
(B), in romantic relationships the frequency and duration are very high because couples, especially newly minted ones, want to spend as much time with each other as possible. The intensity of the relationship will also be very high.

• 1
   (A) For example (B) Conversely
• 2
   (A) Nonetheless (B) Furthermore
• 3
   (A) Therefore (B) As a result
• 4
   (A) In the same way (B) Thus