21. As my own studies have advanced，I have been increasingly impressed withthe functional similarities between insect and vertebrate societies and less sowith the structural dif
Competition is not only good in itself, it is the means by which otherbasic American values such as individual freedom, equality of opportunity andhard work are protected.
我们来看一个长难句： Behaviorists suggest that the child who is raised in an environment wherethere are many stimuli which develop his or her capacity for appropriateresponses
1. Some have breathed sighs of relief, others, including churches,right-to-life groups and the Australian Medical Association, bitterly attackedthe bill and the haste of its pa
At the same time, the American Law Institute--a group of judges, lawyers, and academics whose recommendations carry substantial weight--issued new guidelines for tort law stati
51. Unlike most of the world"s volcanoes, they are not always found at the boundaries of the great drifting plates that make up the earth"s surface; on the contrary, many of them
1. The American economic system is, organized around a basically private-enterprise, market- oriented economy in which consumers largely determine what shall be produced by spendi
