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
32
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
图示结构用位移法求解时,Rip=( )。
下述各项中()是基金职业道德的核心规范。
根据以下资料。回答126-130题 2005--2013年,南非主要工业产
近几年来,我国开始对国内20个制造业行业中820家企业的采购经理进行月度问卷调查
法律的产生经历了一个从习惯到习惯法再到成文法的发展过程。( )。
我国的能源条件可以概括为( )。A.缺煤、富油、少气B.富煤、缺油、少气C.缺煤、缺油、多气D.富煤、富油、多气
根据《医疗机构制剂注册管理办法(试行)》,可以作为医疗机构制剂申报的品种是A.市场上已有供应,但价格昂贵的品种B.市场上没有供应的经典方剂C.中药、化学药组
Theboyaheadofmeismyclassmate.A:atthebackof B:behindC:infrontof D:
下列属于公路范畴的有()。 A.高速公路 B.环形公路 C.绕行公路 D.辐射公路 E.城间公路
ABC会计师事务所是一家合伙会计师事务所,主要提供财务报表审计、税务规划、咨询和财务顾问等业务。在2017年承接的业务中有如下情况: (1)ABC会计师...