单项选择题
A．spread B．send C．hear D．confirm
These animals (migrate) south annually in search of foo...
单项选择题These animals (migrate) south annually in search of food.（）
A．explore B．travel C．inhabit D．prefer
It seemed (incredible) that he had been there a week al...
单项选择题It seemed (incredible) that he had been there a week already.（）
A．right B．unbelievable C．obvious D．unclear
The rules are to (rigid) to allow for human error.（）A．g...
单项选择题The rules are to (rigid) to allow for human error.（）
A．general B．complex C．direct D．inflexible
