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
Scientists have created a tomato that can grow on salty water. The plant is the first crop of its kind ever produced in the worl
Scientists have created a tomato that can grow on salty water. The plant is the first crop of its kind ever produced in the worl
admin
2011-02-04
73
问题
Scientists have created a tomato that can grow on salty water. The plant is the first crop of its kind ever produced in the world.
Its significance can not be overestimated (高估). The new technology can help mankind solve the problem of feeding its ever-expanding population. It is estimated that by 2025 the world population will amount to more than 9 billion, an increase of 3 billion over 2000. Each day 240,000 more people are born, ready to be fed like the rest of us. Unfortunately, not all the land on Earth can be used to grow crops for humans. About 24.7 million acres of the problem is irrigation (灌溉). When farmers water their crops, salts in the water also enter the soil. Over time, salts such as sodium (钠) and calcium (钙) build up to such a point that they severely harm the growth of crops. Salts destroy most plants’ ability to draw up water through their roots.
But, the new variety of tomato produced by American and Canadian scientists can store salts in its leaves so that the fruit doesn’t taste salty. Researchers hope this technology will enable areas of poor-quality land to become productive (多产的). And they can feed some of the world’s growing population.
What is the population of the world in 2000 according to the passage?
选项
A、About 9 billion.
B、About 6 billion.
C、About 3 billion.
D、About 5 billion.
答案
B
解析
计算题。根据It is estimated that by 2025 the world population will amount to more than 9 billion, an increase of 3 billion over 2000. 可以计算出2000年的人口为60亿,故选B。
转载请注明原文地址:https://kaotiyun.com/show/utlK777K
本试题收录于:
大学英语三级A级题库大学英语三级分类
0
大学英语三级A级
大学英语三级
相关试题推荐
ThomasEdisondidthingsinthisorder______.Ofalltheinventions,______wasprobablythemostimportantforcivilization.
Whatdidtheydecidetodo?Theydecidedto______.Whatarecamelssometimescalled?Camelsaresometimescalled"______".
A—artificialintelligenceB—knowledgeeraC—commandandcontrolD—computerizationE—intellectualprope
26rueWashington75008PARIS
AnewreportoftheUnitedNationsshowsthat,ifthepresentgrowthrateof2percentperyearcontinues,today’sworldpopulat
A、Thelargenumberofimmigrantsthere.B、Thevarietyofrestaurantsthere.C、Americans’loveofunusualfoods.D、Theespecially
A、Hedidn’tseethemovie.B、Themoviecouldhavebeenbetter.C、Themovieisthemostwonderfulmoviehe’severseen.D、Themov
A、Watchingabasketballmatch.B、Cleaningupthenewapartment.C、GoingtothecinemawithMargaret.D、Goingshoppingwithherf
A、Intheheadmaster’soffice.B、Inahospital.C、Inalanguagelab.D、Attwelveo’clock.A从文中可听到“gotapain”,男士给予了解决的方法,可推测出答案B正
Auctionedgoodsaresold______.Theendofthebiddingiscalled"knockingdown"because______.
随机试题
成人高血压的诊断标准是()
WhatisthetypicalAmericanfamily【21】?MarriedAmericanadultswillnametheirhusbandorwifeandtheirchildren【22】their"im
可摘局部义齿基牙的倒凹深度是指
桥梁结构的设计基准期为______年?
关于钢筋绑扎,以下说法正确的是()。
下列方法中,可用于建设工程风险分析与评价的是()。
内河航运工程建设项目总概算中其他费用包括()等费用。
(2009年考试真题)在债券的票面价值中,首先要规定票面价值的()。
优秀的儿童剧会理性、谨慎地告诉孩子生活的经验,让孩子们逐步认识生活,认识自己。儿童剧的教育功能是融化在艺术魅力中的,不能强迫儿童剧承担过于沉重的主题。但是,这也并非意味着儿童剧要一味迎合孩子的兴趣,仅仅以轻松和搞笑的表演吸引他们,儿童剧应以多姿多彩的舞台形
一天晚上,一群游牧部落的牧民正准备安营扎寨休息,忽然被一束耀眼的光芒所笼罩。他们知道神就要出现了。因此,他们殷切地期盼着,恭候着来自上苍的重要旨意。最后,神终于说话了:“你们要沿路多捡一些鹅卵石,把它们放在你们的马褡子里。明天晚上,你们会非常快乐
最新回复
(
0
)