There is a store near my home. It is big. It has lots of things in it. You can buy school things like notebooks, pens, pencil cases, rulers and maps. You can also buy drinks, vegetables, fruit and all kinds of food. It doesn't sell clothes. Some of them are cheap. But some of them are expensive.

    People in the store are very friendly(友好的). They work from eight in the morning to eight in the evening. They work hard(努力地)all day.

有中子衍射技术中，常用热中子研究晶体的结构，因为热中子的德布罗意波波长与晶体中原子间距比较接近。已知中子质量为1.67× 10-27kg，普朗克常量为6.63×10-34J·s，则可以估算出德布罗意波波长为1.82×10-10m的热中子动能的数量为(     )

下列几种动物行为中，属于本能行为的是