某小组探究杠杆平衡条件的实验中发现，当动力臂或阻力臂发生变化时，使杠杆平衡的动力大小就要随之改变，他们为了知道使杠杆平衡的动力大小与两个力臂大小之间的关系，他们在已调水平平衡的杠杆左端悬挂等重的钩码如图所示，将钩码对杠杆的作用力定为阻力F₂，在支点另一侧通过悬挂钩码施加动力F₁，调节动力臂l₁及阻力臂l₂大小使杠杆在水平位置平衡，并将实验数据记录在表一、表二中。

阅读下面短文, 掌握其大意, 然后从所给的四个选项中, 选出一个最佳答案。

    Here is a picture of my 1. I like it very much. It's always very 2. We have a soccer in 3 classroom, but you can't see it. It's under the 4 desk. You can see a map of China and 5 pictures on the walls. My classmates and I draw（画） the pictures. We like our art teacher-Mr Brown very much. He is 6 the USA. But now He is in China with his family . He likes playing 7. After school he often plays basketball with my 8. He likes  9, because he 10 music can make him relaxing.

下列词语中书写完全正确的一项（    ）

完成对话
A: How was your vacation, Fred?
B: ____ .
A: ____ ?
B: I went to the U.S. with my parents.
A: Cool! ____  in the U.S.?
B: First we went to Los Angeles(洛杉矶). My uncle lives there. Then we went to New York to see my cousin.
A: ____ ?
B: It was a little warm but sunny.
A: Did you see any movie stars in Los Angeles?
B: No, but I saw Tom Cruise in New York. He was at a restaurant! I got his autograph.
A: Wow! That’s great!  What else did you do in New York?
B: Hmm…Oh yeah, I also went to Central Park.____ there! .

现在有住宿生若干名，分住若干间宿舍，若每间住4人，则还有19人无宿舍住；若每间住6人，则有一间宿舍不空也不满．若设宿舍间数为 x ，求宿舍间数与学生人数的不等关系.