职称英语历年真题《理工B》补全短文精选
2021年职称英语考试可以开始备考啦，建议大家边学边练，巩固知识，以下是yjbys网小编整理的关于职称英语历年真题《理工B》补全短文精选，供大家备考。
The Tough Grass that Sweetens Our Lives
Sugar cane was once a wild grass that grew in New Guinea and was used by local people for roofing their houses and fencing their gardens. Gradually a different variety evolved which contained sucrose 蔗糖 and was chewed on for its sweet taste. Over time, sugar cane became a highly valuable commercial plant, grown throughout the world. __________ 46
Sugar became a vital ingredient in all kinds of things, from confectionery 糖果点心 to medicine,and, as the demand for sugar grew, the industry became larger and more profitable.__________47
Many crops withered 枯萎 and died, despite growers' attempts to save them, and there were fears that the health of the plant would continue to deteriorate.
In the 1960s, scientists working in Barbodos looked for ways to make the commercial species stronger and more able to resist disease. They experimented with breeding programmes, mixing genes from the more delicate, commercial type. __________48 This sugar cane is not yet ready to be sold commercially, but when this happens, it is expected to be incredible profitable for the industry.
__________ 49 Brazil, which produces one quarter of the world's sugar, has coordinated an international project under Professor Paulo Arrudo of the Universidade Estaudual de Campinas in Sao Paulo. Teams of experts have worked with him to discover more about which parts of the genetic structure of the plant are important for the production of sugar and its overall health.
Despite all the research, however, we still do not fully understand how the genes in sugar cane.
__________50 This gene is particularly exciting because it makes the plant resistant to rust, a disease which probably originated in India, but is now capable of infecting sugar cane across the world.
Scientist believes they will eventually be able to grow a plant which cannot be destroyed by rust.
A. Eventually, a commercial plant was developed which was 5 percent sweeter than before,but also much stronger and less likely to die from disease.
B. One major gene has been identified by Dr Angelique D'Hont and her team in Montpelier, France.
C. Sugar cane is now much more vigorous and the supply of sugar is therefore more guaranteed.
D. Since the 1960s, scientists have been analyzing the mysteries of the sugar cane's genetic code.
E. The majority of the world's sugar now comes from this particular commercial species.
F. Unfortunately, however, the plant started to become weaker and more prone to disease.
答案与解析
46.E。空格前一句甘蔗成了一种极具价值的商业作物，在全世界种植。空白处应继续谈论其价值，故E选项现在世界上大部分糖都是产自这个特殊的商业作物符合文意。
47.F。空格前提到对糖的需求增加，这个行业开始获利，而空格后提到植物枯萎并死掉。前后具有转折关系，所有选项中只有F含有转折词however，故F然而不幸的是这种植物开始变弱，容易得病是正确答案。
48.A。空格前提到了科学家进行不同植物基因混合的实验来培育新品种，空格后提到现在这种甘蔗植物还不准备用做商业用途。由此可知，空白处讲的.应该是关于新的甘蔗品种，故A最终，一种新的商业甘蔗被培养出来，比之前的甜度增加5%，而且比之前的作物要更强壮，发病的可能性更小是正确答案。
49.D。空格后列举了巴西的例子，指出科学家试图发现更多的影响含糖量和产量的基因结构，故D项自20世纪60年代起，科学家一直在研究甘蔗基因代码的秘密是正确答案。
50.B。空格前提到研究者们仍然无法完全了解甘蔗的基因，空格后提到这个基因尤其令人兴奋，其中的this gene应该指代空白处提到的某个基因，故8选项一个主要的基因已经由Angellique D’Hont博士及其团队鉴别出来了符合文意。