【单选题】Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need. It has been demonstrated that rats will, when given a choice over a period of time, prefer w...
A.
encourage rats to drink vitamin-enriched water
B.
find out rats' preference in flavor
C.
test whether rats know which drink is good for them
【单选题】Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need. (7) It has been demonstrated that rats will, when given a choice over a period of time, pref...
A.
encourage rats to drink vitamin-enriched water
B.
find out rat's preference in flavor
C.
test whether rats know which drink is good for them