问题 选择题

下列关于参照物的说法中,错误的是(  )

A.物体是运动还是静止,跟参照物的选择有关

B.参照物是一些不动的物体

C.不选定参照物就无法确定物体是否运动

D.运动和静止是相对于参照物来说的

答案

A、任何物体都可以选作参照物,只是选择不同的物体作参照物时,研究对象的运动状态可能不同,故判断一个物体是静止还是运动,与参照物的选择有关;故本选项说法正确,不符合题意;

B、参照物可任意选择,既可以是运动的物体,也可以是静止的物体,具体选哪一种物体为参照物,是以研究问题的方便而定的,故本选项说法错误;符合题意;

C、因为运动和静止是相对的,所以,不事先选定参照物,就无法对某个物体的运动状态作出肯定的回答,说这个物体是运动或静止是毫无意义的.故本选项说法正确;不符合题意;

D、运动和静止是相对于参照物来说的,故本选项说法正确,不符合题意.

故选B.

阅读理解

Many cities around the world today are heavily polluted. Careless methods of production and lack of consumer demand for environment (环境) friendly products have contributed to the pollution problem. One result is that millions of tons of glass, paper, plastic, and metal containers are produced, and these are difficult to get rid of.

However, today, more and more consumers are choosing “green” and demanding that the products they buy should be safe for the environment. Before they buy a product, they ask questions like these: “Will this shampoo damage the environment?” “Can this metal container be reused or can it only be used once?”

A recent study showed that two out of five adults now consider the environmental safety of a product before they buy it. This means that companies must now change the way they make and sell their products to make sure that they are “green,” that is, friendly to the environment.

Only a few years ago, it was impossible to find green products in supermarkets, but now there are hundreds. Some supermarket products carry labels(标签) to show that the product is green. Some companies have made the manufacturing (生产) of clean and safe products their main selling point and emphasize it in their advertising.

The concern for a safer and cleaner environment is making companies rethink how they do business. No longer will the public accept the old attitude of “Buy it, use it, throw it away, and forget it. ”The public pressure is on, and gradually business is cleaning up its act.

64. It becomes clear from the text that the driving force(动力) behind green products is ______

A. public caring for the environment    B. companies desire for bigger sales

C. new ways of doing business      D. rapid growth of supermarkets

65. What would be the best title for the text?

A. Business and People  B. Business Goes Green

C. Shopping Habits Are Changing D. Supermarkets and Green Products

66. The underlined word “it” in the fourth paragraph refers to _____

A. a selling point    B. the company name

C. a great demand for health foods       D. the manufacturing of green products

单项选择题