题目

— It's very nice of you to prepare for the party with me. — ________ to help. A . Glad B . Sad C . Hungry D . Poor 答案：A世界的物质是在不断运动变化的，下列变化前者属于物理变化，后者属于化学变化的是（　　）A．菜刀生锈面包发霉B．衣服凉干粮食酿酒C．食盐水的蒸发汽油挥发D．酒精燃烧塑料受热变软