根据以下内容回答题：Are some people born clever and others born stupid?Or is intelligence developed by our.environment and our experience?Strangely enough，the（1）to both these questions is YES．To some extent，our intelligence is given us（2）birth，and no amount of special education can（3）a genius out of a child born with low intelligence．On the other hand，a child who lives in a（n）（4）environment will develop his intelligence less than one who lives in rich and varied surroundings．Thus the limits of a person’s intelligence are fixed at birth，（5）whether or not he reaches those limits will depend on his environment．This view，now（6）most extems，can be supported in a number of ways． It is easv to show that intelligence is to some extent something we are born with．The closer the blood relationship between people，the closer they are（7）to be in intelligence-Thus if we take two unrelated people（8）from the population，it is likely that their degrees of inteUigence will be completely different．If on the other hand we take two identical twins，they will venr likelv be as．intelligent as（9）．Relations like brothers and sisters，parents and children，usuallv have similar intelligence，and this clearly（10）that intelligence depends on birth．

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