CONCEPTION and cancer, which mark the beginning and, often, the end of life, share some molecular details. Cancer cells copy their contents and divide rapidly; so do newly fertilized eggs. This requir...
There seems never to have been a civilization without toys, but when and how they developed is unknown. They probably came about just to give children something to do.In the ancient world, as is today...
Brazil has become one of the developing world’s great successes at reducing population growth-but more by accident than design. While countries such as India have made joint efforts to reduce bi...
The rise of multinational corporations (跨国公司), global marketing, new communications technologies, and shrinking cultural differences have led to an unparalleled increase in global public relat...
The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 in...
Directions: In this part there is a short passage with five questions or incomplete statements. Read the passage carefully. Then answer the questions or complete the statements in the fewest possible ...
So long as teachers fail to distinguish between teaching and learning, they will continue to undertake to do for children that which only children can do for themselves. Teaching children to read is n...
The appeal of advertising to buying motives can have both negative and positive effects consumers may be convinced to buy a product of poor quality or high price because of an advertisement. For examp...
President Coolidge’s statement, The business of America is business,” still points to an important truth today-that business institutions have more prestige (威望) in American society th...
The view over a valley of a tiny village with thatched (草盖的) roof cottages around a church; a drive through a narrow village street lines with thatched cottages painted pink or white; the sight ...