将大粒的花生种在贫瘠的土壤中，结出的花生较小，这种变异____ （“能”或“不能”）遗传给后代。因为这种变异单纯是由____ 变化引起的而其内部的____ 并没有改变。

已知点（2，5）和（8，3）是函数y=﹣k|x﹣a|+b与y=k|x﹣c|+d的图象仅有的两个交点，那么a+b+c+d的值为____ 

一个非零整数的倒数，一定是真分数．

   American boys and girls like watching TV. Some children spend six hours a day at school and four to six hours a day in front of the TV sets. Some children even watch TV for eight hours or more on Saturday.
   Television（电视）is like books and films . A child can learn good things and bad things from it. Some TV programs help children to understand the news, the people and places from other countries. With TV, children do not have to go out to see films, they can hear interesting music or watch a game at home. But some programs are bad for children, so parents sometimes help them to find other interesting and useful things to do.