2014
高考英语阅读理解基础极品训练题（21）及答案 a a sign can be found in the front yard of a house in the us. the people living here want to let their dog play outside and ensure it won’t run into the street. so, they hire a company to set up an “invisible fence”, an electric wire buried in the ground around the yard. the dog wears a special collar and when it walks near to
