双嘧达莫抗血小板的作用机制是抑制（）

We can infer from the first paragraph that（）.

A．farming people occupies a small proportion
B．farming people occupies a large proportion
C．the U.S used to be an industrial country
D．the U.S used not to be developed in agriculture

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听力原文： Albert returned home one evening and found a large dog by his gate. He loved animals very much and as he happened to have a small piece of chocolate in his pocket, he gave it to the dog. The next day, the dog was there again. It held up its head and received another piece of chocolate. Albert called his new friend 'Bingo'. He never found out the dog's real name, nor who its owner was. However, Bingo appeared regularly every afternoon and clearly liked chocolate better than bones. It soon was not satisfied with small pieces of chocolate and wanted a large piece of chocolate every day. If at any time Albert forgot to give it a piece of chocolate, Bingo would get very angry and would refuse to let him open the gate. Now Albert had to spend a large part of his money on chocolate in order to get into his own home! So finally he had to move somewhere else.(30)A．He found a piece of chocolate in his pocket.B．He was given a piece of chocolate by someone.C．He found a large dog by his gate.D．He found his dog lost. 点击查看答案