12．A.important

　　B．necessary

　　C．impossible

　　D．unavoidable

　　答案　C

　　解析　句意为：一旦形成这种习惯，就不可能打破它了。important重要的；necessary必需的；impossible不可能的；unavoidable不可避免的。根据下文“I have never been able to break myself of the habit for fifty years.”可知，只有impossible符合语境。故答案为C项。

　　.阅读理解

　　Before India gained its freedom，many Westerners were extremely shocked by its poverty and so they came to serve here.A special girl called Agnes Goxa Bojaxiu was among them，who is today known as Mother Teresa.

　　Agnes was born on August 27,1910 and was just 19 years old when she came to Calcutta on January 6,1929.And she never left this country.Her aim in life was to serve the sick and the poor and she dedicated(献身)her full life to this purpose.She would walk around the dangerous，dark and dirty streets of Calcutta at night，offering food to the sick and shelter to the poor.When she first arrived in Calcutta，she had little money on her and was helped by a priest.

　　Through her efforts she managed to open several institutions to help the downtrodden(受欺压的)and the mentally and physically challenged children.She had a thousand institutions working under her.Mother Teresa was awarded the Nobel Peace Prize in 1979 and the Bharat Ratna in 1980.Besides these she also received the Jawaharlal Nehru Award for International Peace(1972)，Ramon Magsaysay Award(1962)and the Templeton Foundation Award(1973)．

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