单项选择题
A. one hundred miles B. three hundred miles C. one hundred and fifty miles D. six hundred miles
A. is threatening USA B. is threatening Great Britain C. is threatening USA and Great Britain D. is threatening outside Great Britain
A. Many animals have poor eyesight while their sense of smell, is quite good. B. Dogs are color blind. C. The human sense of smell is not good. D. Dogs can see no more than shades of gray.