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  3. The year 2005 is the midpoint of a decade that spans three unique, important transition in the history of humankind.

The year 2005 is the midpoint of a decade that spans three unique, important transition in the history of humankind.

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问题     The year 2005 is the midpoint of a decade that spans three
unique, important transition in the history of humankind.                      【S1】______
Before 2000, young people always outnumber old people.                         【S2】______
From 2000 forward, old people will outnumber young
people. Until approximately 2007, rural people will have
always been outnumbered urban people. From approximately                       【S3】______
2007 forward, urban people will not outnumber rural people.
From 2003 on, the median woman worldwide have had, and
will continue to have, too few or just enough children
during her lifetime to replace themselves and the father in                    【S4】______
the following generation.
    The century with 2000 as its midpoint marks three
additional unique, important transitions in human history.
First, any person who died before 1930 had lived through                       【S5】______
a doubling of the human population. Nor is any person
born in 2050 or later likely to live through a doubling of
the human population. On contrast, everyone 45 years old                       【S6】______
or elder today has seen more than a doubling of human                          【S7】______
numbers from three billion in 1960 to 6.5 billion in 2005.
The peak population growth rate ever reached about 2.1
percent a year, that occurred between 1965 and 1970. Human                     【S8】______
population never grew with such the speed before the 20th                      【S9】______
century and is never again likely to grow with such speed.
Our descendants will look back on the late 1960s peak like                     【S10】______
the most significant demographic event in the history of
the human population even though those of us who lived
through it did not recognize it.
【S1】
选项
答案transition—transitions。
解析 本题中transition是可数名词，表示“转变，过渡”的意思，根据前面所用数词three，可知此处表示“3次重要的转变”，因此应该使用复数形式。
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