...as 20 km away.Not only dogs are good at smelling,cats and...
(1)词义猜测题。根据第一段all dogs have one thing in common:an amazing sense of smell.We use our eyes to see the world around us,but dogs use their noses.(所有狗都有一个共同点:惊人的嗅觉。我们用我们的眼睛看世界,而狗用它们的鼻子。)以及Dogs use this