A、Machines can do all the physical work for man. B、Machines can do all the mental work for man. C、All heavy labor should be repl

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问题  
Exercise is beneficial to your heart. A 22-year study was conducted by doctors in(26)California. They(27)found that people who work at physical lobs experience fewer heart attacks than other people. The active people work all the time at moderated speeds. Their daily routine gives them an adequate amount of exercise and helps them stay in shape. (28)However, machines that Call do heavy labor more speedily are replacing this type of work.

选项 A、Machines can do all the physical work for man.
B、Machines can do all the mental work for man.
C、All heavy labor should be replaced by machines.
D、All heavy labor shouldn’t be replaced by machines.

答案D

解析 该题考查对关键句的把握。听时注意到短文最后一句中的表转折关系的副词however,由此可推知正确选项为D。实际四个选项中A和B,及C和D相矛盾,可缩小选择范围。
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