单项选择题
These animals (migrate) south annually in search of food.()
A.explore B.travel C.inhabit D.prefer
单项选择题 It seemed (incredible) that he had been there a week already.()
单项选择题 The rules are to (rigid) to allow for human error.()
单项选择题 The police will need to keep a (wary) eye on this area of town.()