Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. (10 points)

Though not biologically related, friends are as "related" as fourth cousins, sharing about 1% of genes. That is  1  a study,published from the University of California and Yale University in the Proceedings of the National Academy of Sciences, has  2 .

The study is a genome-wide analysis conducted 3  1932 unique subjects which  4  pairs of unrelated friends and unrelated strangers. The same people were used in both  5 .

While 1% may seem  6  , it is not so to a geneticist. As co-author of the study James Fowler, professor of medical genetics at UC San Diego, says, "Most people do not even  7  their fourth cousins but somehow manage to select as friends the people who  8  our kin."

The study  9  found that the genes for smell were something shared in friends but not genes for immunity. Why this similarity exists in smell genes is difficult to explain, for now.  10 , as the team suggests, it draws us to similar environments but there is more  11  it. There could be many mechanisms working together that  12 us in choosing genetically similar friends  13  "functional kinship" of being friends with  14  !

One of the remarkable findings of the study was that the similar genes seem to be evolving  15  than other genes. Studying this could help 16 why human evolution picked pace in the last 30,000 years, with social environment being a major  17  factor.

The findings do not simply explain people's  18  to befriend those of similar  19  backgrounds, say the researchers. Though all the subjects were drawn from a population of European extraction, care was taken to  20  that all subjects, friends and strangers were taken from the same population.

1. [A] when [B] why [C] how [D] what

2. [A] defended [B] concluded [C] withdrawn [D] advised

3. [A] for [B] with [C] on [D] by

4. [A] compared [B] sought [C] separated [D] connected

5. [A] tests [B] objects [C]samples [D] examples

6. [A] insignificant [B] unexpected [C]unbelievable [D] incredible

7. [A] visit [B] miss [C] seek [D] know

8. [A] resemble [B] influence [C] favor [D] surpass

9. [A] again [B] also [C] instead [D] thus

10. [A] Meanwhile [B] Furthermore [C] Likewise [D] Perhaps

11. [A] about [B] to [C]from [D]like

12. [A] drive [B] observe [C] confuse [D]limit

13. [A] according to [B] rather than [C] regardless of [D] along with

14. [A] chances [B]responses [C]missions [D]benefits

15. [A] later [B]slower [C] faster [D] earlier

16. [A]forecast [B]remember [C]understand [D]express

17. [A] unpredictable [B]contributory [C] controllable [D] disruptive

18. [A] endeavor [B]decision [C]arrangement [D] tendency

19. [A] political [B] religious [C] ethnic [D] economic

20. [A] see [B] show [C] prove [D] tell