题目

It was harvest time, and several farm hands were working for $10 an hour.But they were not common laborers(劳工)．They were students who had just graduated from colleges.Mr.Krauss­Malett said he became interested in farming after working in a restaurant and seeing how much food was wasted.They had been in the fields at Hearty Roots Community Farm in the Hudson Valley since 7 a．m.They all said they could not imagine doing any other job.“Farming attracts me, and probably other people, because it's simple work outdoors，” Mr.Bobman said.“It doesn't feel like you're a part of an7．下列命题中，正确的个数为（　　）（1）函数y=$\frac{1}{{a}^{x}}$（a＞0，a≠1）不是指数函数（2）指数函数不具有奇偶性（3）指数函数在其定义域上是单调函数．A．0B．1C．2D．3