题目

完形填空。通读下面的短文，掌握其大意，然后选择能填入相应空白处的最佳答案。Mr. Smith lives in a village. He has a big  1  and a strong dog. His farm is small and he is often  2  in winter. So he goes to a city and  3  work there.Once he stayed there for about two months. When the new year was coming, he4  home to see his wife and children. On his way home, something was wrong with his eyes. When he  5  his door, his dog came out and bit him. His wife  6  to drive it away. The next morning he went to see a doctor. The doctor looked over his eyes ca已知0＜x＜1，则= [     ]A．B．2xC．-D．-2x