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.
The word “affect” in Paragraph 6 could be best replaced by
选项
A “ influence” .
B “ effect” .
C “ stop” .
D “ present” .
答案
A
解析
转载请注明原文地址:https://ti.zuoweng.com/ti/fN9QKKKQ
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。 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...
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
平衡重式叉车是搬运车辆中应用最广泛的一种,它可由司机独立操作完成货物的装卸搬运和
与继发性萎缩性鼻炎有关的因素是 A.家族中有两人以上患有萎缩性鼻炎 B.营养
美国心理学家卡特尔编制的文化公平测验中没有 A.系列推理 B.图画再生 C
根据《建设工程工程量清单计价规范》GB50500-2013,关于单价合同工程计
建筑材料采购的验收方式有()。
给定资料 1.2015年6月13日,2015“筑城广场市民才艺大赛”之“迎接省
患者,女,17岁,颏部外形发育不良,口唇闭合时口腔周围肌肉呈现紧张,面下1/3高度偏大,开5mm,覆盖8mm,磨牙呈现完全的的Ⅱ类咬合关系,上下颌前牙拥挤...
患者,男性,45岁,炎热夏天,在外高空作业3小时,出现大汗、口渴、头晕、胸闷。该病人可能出现了A.日射病B.热射病C.热痉挛D.先兆中暑E.轻度中暑
把0~8岁儿童的教育称为幼儿教育的国家是()。A.中国B.美国C.英国D.日本
可摘局部义齿人工后牙颊舌径宽度小于天然牙的目的是A.提高咀嚼效率B.获得平衡C.防止咬颊D.减少支持组织负荷E.增加固位