题目

Healthy See, Healthy DoVisit the grocery store on an empty stomach, and you will probably come home with a few things you did not plan to buy. But hunger is not the only cause of additional purchases. The location of store displays (摆放) also influences our shopping choices.【1】The checkout area is a particular hotspot for junk food. Studies have found that the products most commonly found there are sugary and salty snacks.【2】 A 2012 study in the Netherlands found that hospital workers were more likely to give up junk food for healthy snacks when the latter were more readily availabl20．如图，物块沿斜面匀速下滑，请画出物块对斜面的作用力．