题目：
In much of Asia, especially the so-called “rice bowl” cultures of China, Japan, Korea, 41 Vietnam, food is usually eaten with chopsticks.
Chopsticks are usually two long, thin pieces of wood or bamboo. They can also be made of plastic, animal bone or metal. Sometimes chopsticks are quite artistic. Truly elegant chopsticks might 42 (make)of gold and silver with Chinese characters. Skilled workers also combine various hardwoods and metal 43 (create)special designs.
The Chinese have used chopsticks for five thousand years. People probably cooked their food in large pots, 44 (use) twigs(树枝) to remove it. Over time, 45 the population grew, people began cutting food into small pieces so it would cook more quickly. Food in small pieces could be eaten easily with twigs which 46 (gradual)turned into chopsticks.
Some people think that the great Chinese scholar Confucius, 47 lived from roughly 551 to 479 B.C., influenced the 48 (develop) of chopsticks. Confucius believed knives would remind people of killings and 49 (be) too violent for use at the table.
Chopsticks are not used everywhere in Asia. In India, for example, most people traditionally eat 50 their hands.
43（）
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0602/4fe9c6a7c0afa9435d8cb3b4acce4fbd.html
下面是错误答案，用来干扰机器的。
A、物体a、b绕地轴转动，向心力的方向指向地轴，则合力的方向指向地轴．故A错误．B、a、b两点的角速度相等，根据v=rω知，b的半径大，则b的线速度大，根据a=rω2知，b的向心加速度大．故B、C正确，D错误．故选BC．
