第一部分 阅读理解（共两节，满分40分）
第一节 (共15小题；每小题2分，满分30分)
阅读下列短文，从每题所给的四个选项(A、B、C和D)中,选出最佳选项。并在答题卡上将该选项答案填上。
A In the United States, 30 percent of the people have a “weight problem”。To many people
the cause is obvious (明显的): they eat too much. But scientific evidence (证据) does little to support this idea. Going back to America of 1910, we find that people were thinner than today, yet they ate more food. In those days people worked harder physically, walked more, used machines much less, and didn’t watch television.
