40. D 推理判斷題。根據第二段最后一句中的"the main reason is that they share the same habits of eating too much and exercising too little”可知,作者認為發胖跟不均衡的生活方式有關。故選D項。
41. A 細節理解題。根據第四段第三句"The key is to develop a balanced and varied program that's fun as well as progressive"可知,進行多樣化的鍛煉會更有意思。故選A項。
42. B 細節理解題。根據最后一段第三句"Indeed, pain is your body telling you something's wrong and continuing to exercise could lead to serious injury.’’可知,如果感覺到持續的疼痛就要停止鍛煉,否則會導致嚴重的傷害。故選B頂。
43. B 目的意圖題。縱觀全文,本文主要闡明有關減肥和鍛煉的幾個錯誤的認識。故選B項。