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
26
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
把下面的六个图形分为两类,使每一类都有各自的共同规律或特征,分类正确的一项是:
女性,30岁,因卵巢\"囊腺瘤\"手术治疗,术中诊断为\"卵巢透明细胞癌ⅠA\"。GPA
下列哪项提示胎盘功能不正常
婚姻登记处的社会工作者小李在接待过程中,发现正准备离婚的王女士反复动员5岁的女儿
目前,( )经过房屋产权单位批准并补交了土地收益后,可以在市场上进行流通。
语文课学习作文的写作规则,这类学习主要属于()。 A.言语信息学习 B.动作
以下说法错误的是()。A.2005—2014年,我国酒店客房用品市场规模取得了快速增长B.2005—2014年,我国酒店客房用品市场规模累计近2400
住宅外的其他建筑,建筑高度大于( )的非单层建筑属于高层建筑。A.27mB.24mC.32mD.50m
女性,46岁,消瘦,心悸6个月,甲状腺Ⅱ°肿大,无触痛,临床诊断为Graves病。给予丙基硫氧嘧啶(300mg/日)及普萘洛尔治疗2周,病人出现怕冷,易困...
患者,男,29岁。全身皮肤发黄,伴有发热,头痛,恶心呕吐,舌质红,苔黄腻,脉弦滑。建议选择以茵陈为主配伍治疗。 茵陈的功效是A.清热利湿、止呕B.清热利湿