职称英语考试

【单选题】Biotechnology Biotechnology in one form or another has flourished since prehistoric times. When the first human beings realized that they could plant their own crops and breed their own animals, they learned to use biotechnology. The discovery that fruit juices fermented(发酵) in wine, or that milk could be converted into cheese or yogurt(酸乳酶) or that beer could be made by fermenting solutions of malt(麦芽) and hops(啤酒花) began the study of biotechnology. When the first bakers found that they could make a soft, spongy(多乳的) bread rather than a firm, thin cracker they we’’re acting as fledgling(缺乏经验的) biotechnologists. The first animal breeders, realizing that different physical traits could be either magnified or lost by mating appropriate pairs of animals, engaged in the manipulations of biotechnology.What then is biotechnology The term brings to mind different things. Some think of developing new types of animals. Others dream of almost unlimited sources of human therapeutic (治疗的) drugs. Still others envision (想象) the possibility of growing crops that are more nutritious(有养分的) and naturally pest-resistant (有抵抗力的) to feed a rapidly growing world population. This question elicits (引发) almost as many first-thought responses as there are people to whom the question can be poseD、In its purest form, the term "biotechnology" refers to the use of living organisms or their products to modify human health and the human environment. Prehistoric biotechnologists did this as they used yeast cells to raise bread dough(生面团) and to ferment alcoholic beverages, and bacterial cells to make cheeses and yogurts and as they bred their strong, productive animals to make even stronger and more productive offspring. Throughout human history, we have learned a great deal about the different organisms that our ancestors used so effectively. The marked increase in our understanding of these organisms and their cell products gains us the ability to control the many functions of various cells and organisms. Using the techniques of gene splicing(叠接) and recombineDN
A、technology, we can now actually combine the genetic elements of two or more living cells. Functioning lengths ofDN
A、can be taken from one organism and placed into the cells of another organism.As a result, for example, we can cause bacterial cells to produce human molecules cows can produce more milk or the same amount of feed, and we can synthesize the rapeutic molecules that have never before existeD、According to the passage, which of the following is NOT an application of biotechnology
A、People made beer by fermenting solutions of malt and hops.
Bakers used flour and sugar to make a firm, thin cracker which is delicious.
C．Workers converted milk into cheese.
D．Animal breeders mated appropriate pairs of animals to magnify their traits.

网考网参考答案：B
网考网解析：
文中提到的使用生物技术的例子，包括A)用大麦和啤酒花发酵制成啤酒；C)用牛奶制成奶酪；D)将适当的动物进行交配以扩大他们的优点，A)、C)、D)均不符合题意；B)用面粉和糖制成美味的硬薄饼干，不是利用生物技术，而是中文举的用生物技术制做软的、蓬松的面包的一个反证，B)是正确答案。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>