DOC《英语模拟考试试题》

s nature C. monkeys, like humans, tend to be envious of each other D. no animals other than monkeys can develop such feelings 30. Female monkeys of this kind are chosen for the research most probably because they are ___ . A. more likely to weigh what they get B. attentive to researchers'

instructions C. nice in both appearance and behaviors D. more ready to help others........