while循环和do...while循环的区别是________。The different between while loop and do-while loop is:
A．没有区别,这两个结构任何情况下效果一样There is no difference,they are the sameB．while循环比do…while循环执行效率高While is more efficient than do-whileC．while循环是先循环后判断,所以循环体至少被执行一次The While loop does the loop first then check the condition, so the loop body can be executed at least for 1 timeD．do…while循环是先循环后判断,所以循环体至少被执行一次The Do-While loop does the loop first then check the condition, so the loop body can be executed at least for 1 timE．