I.Introduction 1. Introductory Remarks Are there any sounds we cannot hear? Yes But does it mean there is something wrong with our hearing? As a matter of fact, most of us can only hear the sound vibrations that occur within the range of 20 times per second to 20 000 times per second. Those below

Today's modern communication technology is quite advanced. It is optical fibers and lasers, together with the striking improvements in computing that have made such remarkable communication possible. By using the telephone-line with expanded capacity, people can send messages not only in the form of sound but also in written words graphs and even moving pictures on the Internet

Circle the best answer according to the passage. 1. To many people the Bermuda Triangle is really a mystery because A. it is called \Devil's Triangle\ B. a lot of books have been written about the area . the lost continent of Atlantis lies somewhere in that area

I. Summary of the Text Beijing,may5,1998 Intel announces that it will invest US$50 0 million to open an information technology research and development center in Beijing, China The Intel China Research Center will explore Internet-related issue and information technology disciplines. It will improve the fundamental research level in high technology in China and promote the exchange and cooperation between

Unit siⅸ Text A I. Pre-Reading Task 1. What makes human beings different from animals? A. The ability to use tools. B. The learning and sharing of behavior . The use of language. 2. Do you think animals have a culture? If yes, give an example

Culture is thought to be the thing only humans have. Studies of animals however, show that chimpanzees can make and use tools like man. Monkeys can learn to do something from each other. Apes can even be taught some forms of language. We find that certain animals do culture similar to that of human beings and the line dividing us from them is not as clear as we used to think

I. Summary Learning behavior of animals varies to the different conditions and can be reinforce by certain repeated conditions. Pavlov called this kind of reaction conditioned reflex. Learning that animals are capable of also has something to do with intelligence, Different species have their own abilities to do different things. The distinguishable difference between man and animals maybe that the latter cannot really speak

Unit Five Text B I. Pre-Reading Task 1.\Intel is the name of a(n A U.S. company B. IBM computer C government department D branch of the Internet 2. China is a country scientists and engineers in terms of computing technology

The bermuda triangle L. Introduction 1. Introductory Remarks The Bermuda Triangle. also called the Devils Triangle is an area of the Atlantic Ocean off southeast Florida, where the disappearance of ships and airplanes on a number of occasions has led to considerable interest in unexplainable losses and other

第一节制造业企业主要经济业务概述 一、制造业企业的主要经济业务内容 制造业企业是以产品的生产和销售为主要活动内容的经济组织。其主要经济业务内容可归纳为以下5种: