【单选题】Passage 4 Questions 16 to 20 are based on the following passage: 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 th...
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】Passage 4 Questions 16 to 20 are based on the following passage: 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 th...
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