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(A)Scientists change their minds as the evidence they gather becomes more precise and more conclusive.
(B)The conclusions are stark.
(C)Nearly every drop of water that flows downstream is already allocated.
(D)Over the past couple of decades, climatology has become a deeply historical science.

5 (A)The sexual revolution, like most revolutions, has left an array of issues that did not exist before. (B)Some, perhaps many divorces, are rooted in one form or another of real or perceived sexual dissatisfaction. (C)Fifty percent of women remarry within five years of a divorce and seventy-five percent within ten. (D)So we now not uncommonly have divorce followed by remarriage—a sort of trial-and-error approach until couples finally get it right.

6 (A)The sexual revolution, like most revolutions, has left an array of issues that did not exist before. (B)So we now not uncommonly have divorce followed by remarriage—a sort of trial-and-error approach until couples finally get it right. (C)Partners may find themselves yearning for someone new, different, and exciting. (D)Freedom offered by the change in divorce law can be seen as a healthy thing.

7 (A)Fifty percent of women remarry within five years of a divorce and seventy-five percent within ten. (B)Some, perhaps many divorces, are rooted in one form or another of real or perceived sexual dissatisfaction. (C)Partners may find themselves yearning for someone new, different, and exciting. (D)Freedom offered by the change in divorce law can be seen as a healthy thing.

8 (A)So we now not uncommonly have divorce followed by remarriage—a sort of trial-and-error approach until couples finally get it right. (B)Partners may find themselves yearning for someone new, different, and exciting. (C)Freedom offered by the change in divorce law can be seen as a healthy thing. (D)The sexual revolution, like most revolutions, has left an array of issues that did not exist before.

10 (A)Over the past couple of decades, climatology has become a deeply historical science. (B)The fundamental challenge for us all is to change the way we live. (C)But the testimony of tree rings shows that those years were much wetter than the long-term historical average. (D)The conclusions are stark.

11 (A)Nearly every drop of water that flows downstream is already allocated. (B)The fundamental challenge for us all is to change the way we live. (C)Over the past couple of decades, climatology has become a deeply historical science. (D)The conclusions are stark.

12 (A)The fundamental challenge for us all is to change the way we live. (B)Nearly every drop of water that flows downstream is already allocated. (C)But the testimony of tree rings shows that those years were much wetter than the long-term historical average. (D)Scientists change their minds as the evidence they gather becomes more precise and more conclusive.

13 (A)A love marriage is the type we are familiar with in the West. (B)Some Japanese feel that romantic love is not the most important ingredient in a successful marriage. (C)The person who does becomes the go-between, showing the packet to the potential bridegroom and, if both parties are interested, arranging a meeting between them. (D)When a young woman reaches marriageable age, she and her parents compile a packet of information about her, including a photograph of her and descriptions of her background, education, hobbies, and interests.

14 (A)A love marriage is the type we are familiar with in the West. (B)Most Japanese marriages today are arranged marriages. (C)When a young woman reaches marriageable age, she and her parents compile a packet of information about her, including a photograph of her and descriptions of her background, education, hobbies, and interests. (D)The person who does becomes the go-between, showing the packet to the potential bridegroom and, if both parties are interested, arranging a meeting between them.

15 (A)Most Japanese marriages today are arranged marriages. (B)It is not uncommon for a woman to have ten or more such introductions before she finds the man she wants to marry. (C)The person who does becomes the go-between, showing the packet to the potential bridegroom and, if both parties are interested, arranging a meeting between them. (D)When a young woman reaches marriageable age, she and her parents compile a packet of information about her, including a photograph of her and descriptions of her background, education, hobbies, and interests.