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
Lack of Vitamin A is the leading cause of blindness among children in developing countries. These children do not get enoug
Lack of Vitamin A is the leading cause of blindness among children in developing countries. These children do not get enoug
admin
2016-03-29
19
问题
Lack of Vitamin A is the leading cause of blindness among children in developing countries.
These children do not get enough Vitamin A in the food they eat.
In Africa, more than 3,000,000 children【B1】______blindness or sickness caused by lack of Vitamin A Scientists say sweet potatoes are rich in beta carotene(β-胡萝卜素)—the natural orange-colored【B2】______ that the human body needs to produce Vitamin A.
One recent study found that orange-colored sweet potatoes are an excellent food for families in southern and eastern Africa. Scientists from Kenya, Uganda and the International Potato Center in Peru【B3】______ the ten-year study. The scientists found that several kinds of sweet potatoes produce excellent harvests in some areas where Vitamin A【B4】______ is widespread. They said sweet potatoes provided large amounts of Vitamin A at a very low cost.
People in Africa liked the orange-colored sweet potatoes used in the study. Some people had thought Africans would not accept such potatoes because they are sweeter than 【B5】______ sweet potatoes. The traditional African sweet potato is white and 【B6】______ little or no beta-carotene. However, research studies and taste tests showed the new sweet potatoes are able to【B7】______ the local crops. Wanda Collins is a research【B8】______ at the International Potato Center. She says the study found that mothers in Africa accepted the orange-colored sweet potatoes. Women who knew the value of these potatoes continued to buy them when food【B9】______ caused price increases. Ms. Collins says the next step is to develop this【B10】______ crop in other areas of Africa.
【B2】
选项
答案
substance
解析
根据空格前的修饰语the natural orange-colored可知,此空需填入名词性成分。substance“物质”。
转载请注明原文地址:https://kaotiyun.com/show/CJe7777K
0
大学英语四级
相关试题推荐
Differentthingsusuallystandfordifferentfeelings.Red,forexample,isthecoloroffire,heat,bloodandlife.Peoplesay
ItIsn’tEasyBeingGreenGreenstoriesofhotelsA)Overthesummer,IstayedatfourhotelsintheUnitedStates.Theywer
ItIsn’tEasyBeingGreenGreenstoriesofhotelsA)Overthesummer,IstayedatfourhotelsintheUnitedStates.Theywer
ItIsn’tEasyBeingGreenGreenstoriesofhotelsA)Overthesummer,IstayedatfourhotelsintheUnitedStates.Theywer
A、Problemswiththeteachers.B、Problemswithfamilymembersorfriends.C、Problemswithclasswork.D、Problemswithapart-time
A、Therearetoomanycoursesofferedtostudents.B、Thewomanshouldtakefewercoursesnextterm.C、Themanwilltakefourcour
TherehavebeenalotofreportsthatboysareintroubleinAmericaneducation.Somepeoplesay【B1】______toimproveeducationf
PreparingChildrentoBeSafeatCollegeA)Moneycanbuymanythingstohelpchildrenexcelacademically,liketutorsandprivat
A、Alllanguageshaveequalvalues.B、Somelanguagesneedmoreeffortstolearn.C、Somelanguagesarecertainlymoreimportant.D
A、Heisindifferentoftheinterview.B、Heisworriedabouttheresult.C、Heisconfidentabouthisperformance.D、Heisangryw
随机试题
图式(认知结构)
正确执行适宜的SOP对输血质量管理体系的正常运行的作用错误的是
垄断是对市场某种程度的垄断和完全垄断使得资源配置缺乏效率。()
背景资料:某承包商于某年承包某外资工程的施工,与业主签订的承包合同约定:工程合同价2000万元;若遇物价变动,工程价款采用调值公式动态结算;该工程的人工费占工程价款的35%,水泥占23%,钢材占12%,石料占8%,砂料占7%,不调值费用占15%;开工前业
某企业2012年有一处地下建筑物,为商业用途房产(房产原价80万元),10月底将其出售。当地政府规定房产原值减除比例为30%,商业用途地下建筑房产以原价的70%作为应税房产原值。2012年该企业应缴纳房产税()元。(2013年)
关于对纳税人、扣缴义务人未缴少缴税款的追征制度,下列说法正确的是()。
产品处于生命周期不同的阶段,其营销策略也会有所不同。当某种产品处于成熟期时,适宜采取的营销策略包括()。
“雪化了变成什么?”一个学生回答:“变成了春天!”这个富有想象力、艺术性的答案却被老师判为零分。老师的做法忽视的是()。
我国第一部中小学体育教学大纲颁布于( )
WhatisEntertainmentTonight?
最新回复
(
0
)