？？
？？B？？
？？Joseph Lemasolai wrote a book about his life.His people,the Maasai,are nomads,meaning they do not stay in one place for long.They move their villages in search of good grass and fresh water for their cattle.The cow is the centerpiece of pretty much everything we do,Joseph explains.“That&39;s why we move.We could not be nomads without cattle.You can’t move for nothing --you can&39;t just walk around.？？
？？When he was very young,Joseph spent much of his time looking after his family&39;s cattle，taking them to food and water and watching out for lions.He played on the grassland with his friends.？？
？？when Joseph was about six years old，he left his family to attend a boarding school(寄宿學(xué)校).There,Joseph faced difficulties much like other children do.He was laughed at because he was fat.He got into trouble daily with his teachers.？？
？？But Joseph also faced difficulty most children do not.”Every time school closed for vocation,I had to find my way home,“Joseph says,”That was one of the hardest things:“The village might be 5 miles a way,or it might be 50.Sometimes I wouldn&39;t know exactly where my family was.I had to search for them.”？？
？？Joseph later attended high school in a city.After graduation，he went to college.Finally，he became a social studies teacher,and now he is teaching seventh and eighth graders at a school.
？？Every summer,Joseph travels back to the grassland to visit his mother,brothers,and fri？？ends. And he takes a group of students with him to see both the beauty and the difficulty of growing up in that part of the country.“I like to show them the other side of the coin.”Joseph says.
？？The word“centerpiece”in Paragraph I means“________”.
？？
A.the most important part
B.the things already done
C.the reason of moving
D.the animal in the middle
When school dosed for vocation，Joseph usually had great difficulty________.A.finding out where his home and village were
B.understanding what he was required to do
C.getting in touch with his teachers
D.walking 5 to 50 miles in a day
Before going to school，Joseph spent a lot of his time________.A.watching liens on the grassland
B.getting food and water for his family
C.taking care of his family’s cattle
D.visiting his friends from place to place
By taking some of his students home，Joseph wants them to________.A.deal with difficult situations
B.realize what the people really need
C.know about his love for his family
D.learn about a different way of living
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Though not biologically related, friends are as “r...
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)__1,932 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 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 the similar genes seem to be evolution_(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
2A.defended
B.concluded
C.withdrawn
D.advised
3A.for
B.with
C.on
D.by
5A.tests
B.objects
C.examples
D.samples
4A.compared
B.sought
C.separated
D.connected
12A.drive
B.observe
C.confuse
D.limit
13A.according to
B.rather than
C.regardless of
D.along with
16A.forecast
B.remember
C.understand
D.express
17A.unpredictable
B.contributory
C.controllable
D.disruptive
18A.endeavor
B.decision
C.arrangement
D.tendency
7A.visit
B.miss
C.seek
D.know
8A.resemble
B.influence
C.favor
D.surpass
9A.again
B.also
C.instead
D.thus
10A.Meanwhile
B.Furthermore
C.Likewise
D.Perhaps
11A.about
B.to
C.from
D.like
14A.chances
B.responses
C.missions
D.benefits
15A.later
B.slower
C.faster
D.earlier
6A.insignificant
B.unexpected
C.incredible
D.unbelievable
19A.political
B.religious
C.ethnic
D.economic
20A.see
B.show
C.prove
D.tell