It is _____ whether or not the reforms have improved conditions for people in the poor country. A: debate B: debatable C: detect D: detectable

The mineral oil is used in Dr. Li’sexperiment to _____ A: control the concentration of odours ina slightly detectable degree. B: act as a group of comparison with thatof the other smells. C: regulate the participants’ moods bydecreasing the smell’s concentration. D: protect the participants from losingsense of smell.