D encourage the development of genetic weapons for the war.
15. What is the implication of the sratement of Jeremy Rifkin and Ted Howard?
A The commercial applications of genetic engineering are inevitable.
B Large-scale genetic engineering has occurred in the Untied States.
C Americans are proud of their computers,automobiles and genetic technologies.
D The potential application of each new genetic advance should be controlled.
第四篇
Perfect Competition
Perfect competition exists in an industry that contains many relatively samll firms producing identical products.The most importhant characteristic(特征) of a perfectly competitive industry if that no single firm has any control over prices.This important characteristic follows from two assumptions(假设)。First, a competitive industry is composed of many firms, each being very samll relative to the size of the industry .Snd ,every firm in a perfectly competitive industry producse exactly the same product.
Firms in perfectly competitive industries do not differentiate(区分) their products, nor do they make decisions about price.Rather,each firm takes prices as given-that is ,as determined in the market by the laws of supply and demand -and decides olny how much to produce and how to produce it.Given the availability(可得性) of perfect substitutes, any product priced over the market price will not be sold .
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