首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
下面有3 篇短文,每篇短文后有5 道题。请根据短文内容,为每题 确 定1 个最佳选项 。 “Salty” Rice Plant Boosts Harv...
下面有3 篇短文,每篇短文后有5 道题。请根据短文内容,为每题 确 定1 个最佳选项 。 “Salty” Rice Plant Boosts Harv...
admin
2020-12-24
27
问题
下面有3 篇短文,每篇短文后有5 道题。请根据短文内容,为每题 确 定1 个最佳选项 。
“Salty” Rice Plant Boosts Harvests
British scientists are breeding a new generation of rice plants that will be able to grow in soil containing salt water. Their work may enable abandoned farms to become productive once more.
Tim Flowers and Tony Yeo,from Sussex University’s School of Biological Sciences, have spent several years researching how crops,such as rice,could be made to grow in water that has become salty.
The pair have recently begun a three-year programme, funded by the Biotechnology and Biological Sciences Research Council, to establish which genes enable some plants to survive salty conditions. The aim is to breed this capability into crops, starting with rice.
It is estimated that each year more than 10m hectares of agricultural land are lost because salt gets into the soil and stunts (妨碍生长) plants. The problem is caused by several factors. In the tropics, mangroves (红树林)that create swamps (沼泽)and traditionally formed barriers to sea water have been cut down. In the Mediterranean, a series of droughts have caused the water table to drop, allowing sea water to seep (渗透)in. In Latin America,irrigation often causes problems when water is evaporated (蒸发)by the heat, leaving salt deposits behind.
Excess salt then enters the plants and prevents them functioning normally. Heavy concentrations of minerals in the plants stop them drawing up the water they need to survive.
To overcome these problems, Flowers and Yeo decided to breed rice plants that take in very little salt and store what they do absorb in cells that do not affect the plants5 growth. They have started to breed these characteristics into a new rice crop, but it will take about eight harvests before the resulting seeds are ready to be considered for commercial use.
Once the characteristics for surviving salty soil are known, Flowers and Yeo will try to breed the appropriate genes into all manners of crops and plants. Land that has been abandoned to nature will then be able to bloom again, providing much needed food in the poorer countries of the world.
Which of the following is NOT mentioned as a cause of the problem discussed in the passage?
选项
A Natural barriers to sea water have been destroyed.
B The water table has gone down after droughts.
C Sea level has been continuously rising.
D Evaporation of water leaves salt behind.
答案
C
解析
转载请注明原文地址:https://ti.zuoweng.com/ti/NN9QKKKQ
相关试题推荐
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 TheToughGrassth...
随机试题
引起鼻源性球后视神经炎最常见的是() A.上颌窦炎 B.额窦炎 C.筛窦炎
总体X的概率分布见题表,其中θ(0
(2011年)下列关于数据库系统的说法,正确的有()
--HowaboutgoingoutforapicniconSu
中国证监会及其派出机构可以对以下哪些主体的违法违规行为进行行政处罚? Ⅰ、股权
电解质离子通过细胞膜的扩散量取决于()
肝硬化失代偿期突出的临床表现是A.食管、胃底静脉曲张B.全血细胞减少C.腹腔内出现漏出液D.皮肤色泽变黑E.消瘦贫血营养不良
关于咯血与呕血的鉴别,下列哪项是错误的A.咯血不可能出现黑便,呕血一定出现黑便B.咯血为鲜红色,呕血多为暗红色C.呕血见于消化道疾病D.咯血属碱性,呕血属
会员制期货交易所会员应当履行的义务包括()。A.接受期货交易所监督管理B.遵守国家法律、行政法规、规章和政策C.按规定缴纳各种费用D.执行理事会的决议
借贷资金的“成本”是( )。A.贷款期限B.贷款利率C.本金D.利息