轿车的加速度变化快慢将影响乘坐的舒适度．加速度变化得越慢，乘坐轿车的人会感到越舒适．若引入一个新物理量用于表示加速度变化的快慢，则该物理量的单位应是（　　）

阅读短文，判断下面句子与短文内容是否相符。

    I'm Wendy．I'm from Canada．Now I live in Guangzhou．Guangzhou is windy and cool in winter．It doesn't snow, and sometimes it's rainy．Today is January 28th，Spring Festival．I wear my new sweater and jeans．I go to the park with my parents in the morning．I visit my aunt Alice in the afternoon．In the evening，I have a big meal．I have chicken，beef，fish，mutton， tomatoes and carrots．They are delicious．

某家庭用燃气热水器将质量为100kg，温度为20℃的自来水加热到50℃，消耗的天然气体积为1m³（假设天然气完全燃烧）．已知水的比热容为4.2×10³J/（kg•℃），天然气的热值为3.2×10⁷J/m³．求：