题目

WHEN you think of a typical American, whom do you picture? A pretty blond white American like Taylor Swift? Or a handsome black American like President Barack Obama or basketball star Kobe Bryant? In fact, there was a time when the average American looked like none of these people. Back in the year 1500, the average American was a brown-skinned hunter-gatherer who probably rode a horse and wore clothing made from animal skins. Today, these people－who usually identify themselves based on their individual tribes such as Iriquois, Apache and Navajo－are broadly referred to as “Native下列现象或事实，用分子的相关知识加以解释，其中错误的是（ ）A．热胀冷缩，说明分子的大小随温度的改变而改变B．“酒香不怕巷子深”，说明分子在不断地运动C．25m3的石油气可以装入0.024m3的钢瓶中，说明分子之间有间隔D．水通电后生成氢气和氧气，说明在化学变化中分子可以再分