（）是人们之间最常见的交流方式，也就是通常所说的交谈。
A.内部沟通
B.口头沟通
C.非正式沟通
D.非口头沟通
参考答案：B
在“验证牛顿第二定律”的实验中，某同学做出的a-1m的关系图线，如图所示．从图象中可以看出，作用在物体上的恒力F=______N．当物体的质量为2.0kg时，它的加速度为______m/s2．
根据句意及汉语提示填空。
1. The U. S. A. ____ (代表) the United States of America.
2. There is a square ____ (在……中心) of the city.
3. You can have a bed, ____(至于) him, he'll have to sleep on the floor.
4. My clothes are ____(过时), so I want to buy some western-style clothes.
5. People call Kunming the Spring City. It ____ (得名) because there were many flowers in it.
