首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
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
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
admin
2017-05-31
19
问题
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.【B1】______
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.【B2】______ 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 Barbados looked for ways to make the commercial species stronger and more able to resist disease. They experimented with breeding programmes, mixing genes from the wild species of sugar cane, which tends to be tougher, with genes from the more delicate, commercial type.【B3】______ This sugar cane is not yet ready to be sold commercially, but when this happens, it is expected to be incredibly profitable for the industry.
【B4】______ 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 function in sugar cane.【B5】______ 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. Scientists believe they will eventually be able to grow a plant which cannot be destroyed by rust.
[A] Unfortunately, however, the plant started to become weaker and more prone to disease.
[B] Sugar cane was now much vigorous and the supply of sugar is therefore more guaranteed.
[C] One major gene has been identified by Dr Angelique D’ Hont and her team in Montpe-lier, France.
[D] The majority of the world’ s sugar now comes from this particular commercial species.
[E] Since the 1960s, scientists have been analysing the mysteries of the sugar cane’s genetic code.
[F] The sugar cane’s genetic code has been found by a farmer in 1950.
[G] Eventually, a commercial plant was developed which was 5 percent sweeter than before, but also much stronger and less likely to die from disease.
【B1】
选项
答案
D
解析
上一句说到“随着时间的推移,甘蔗成为一个生长在世界各地的非常有价值的商业作物”,下一句说到“糖在各种事物中都是一种重要成分,从糖果到药物”。由此可知,空格处应讲甘蔗和糖的关系,选项D与上下文联系最紧密,故选D。
转载请注明原文地址:https://kaotiyun.com/show/lCVd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Whatarethesetwotalkingabout?
Letusbeginbysayingthatwhatdoesnotcauseourdreams.Ourdreamsdonotcomefrom"another"world.Theyarenotmessagesf
Whatarethespeakersmainlydiscussing?
Corporationsasagroupofferavarietyofjobs.Mostlargecompaniessendpeopletocollegestointerviewgraduatingstudentsw
Whatdoesthemanproposetodofirst?
Whatdoesthemanproposetodofirst?
WhatwilltheweatherprobablybelikeonThursday?
Futuristslovecomputers.Afterall,40yearsagoelectronicdigitalcomputersdidn’texist;todaymicrochipsastinyasababy’s
Whatisthefirstwordthebabylearnedtosay?
Whatisthefirstwordthebabylearnedtosay?
随机试题
噪声引起的永久性听阈位移早期通常表现为
以银行存款50000元向甲单位投资,该笔业务的发生一方面引起银行存款的减少,另一方面引起实收资本的增加。()
关于英国遗产税的说法错误的是( )。
某电器产品价格2014年为5000元,2015年为5500元,销售额上涨20%,与2014年相比,则()。
保证人清偿票据债务后,不得行使持票人对被保证人及其前手的追索权。()
以下项目中,适用增值税零税率的有()。
有游客委托导游帮助购物并请求代为托运时,导游应该()
三板市场是中国证券业协会主办的代办股份转让系统,由证券公司为非上市公司提供股份转让服务的市场。()
慢性疲劳综合症(CFS)这种疾病究竟属于生理方面还是属于心理方面尚未确定。病理学家做了如下实验:第一组患者被指定服用一种草药软膏,并告诉他们这种软膏是在试用过程中,其中30%的人在接受治疗的3个月内被治愈;第二组患者接受同样的草药软膏治疗,但告诉他们这种软
Thecriminal’s______forleniencywasignoredbythejurors.(2002年复旦大学考博试题)
最新回复
(
0
)