某有机物X的化学式为C6H14O,能和钠反应放出氢气.X经酸性重铬酸钾(K2Cr2O7)溶液氧化最终生成Y(C6H12O2),若不考虑立体结构.X和Y在一定条件下生成酯最多有( )
A:4种
B:8种
C:32种
D:64种
下图为某电子产品生命周期模式图。读图完成下列问题。
The boy is to his teacher.
Helen is going to work in an old people's home to help ________ the old people.