These are some of the new household inventions invented mostly by common people.Thus, a variety of new household items are invented every day, which helps in a better functioning of household chores and in a more useful manner.

　　1．The first paragraph is intended to ________.

　　A．stress the importance of inventions

　　B．introduce the topic of the article

　　C．show the advantages of modern lifestyle

　　D．tell the differences between human beings and animals

　　2．It can be inferred that the sliding cinch is used to ________.

　　A．prevent your shoulder from being over­pressured

　　B．keep your shoulder safe and sound in an accident or an operation

　　C．help you practice your shoulder more often and reduce shoulder pains

　　D．cover your shoulder and make it stronger to resist the outside strike

　　3．Common people can also make good inventions because ________.

　　A．wisdom and inspiration sometimes come from everyday life　

　　B．some inventions are easy to be made and can be mastered by them

　　C．they have a strong desire to do something for science research

　　D．success is often connected with hardship and bitter experience of common people

　　4．The passage mainly talks about ________.

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