首页
登录
职称英语
To many environmentalists, the extinction of plants—accompanied by the increasin
To many environmentalists, the extinction of plants—accompanied by the increasin
游客
2024-01-13
36
管理
问题
To many environmentalists, the extinction of plants—accompanied by the increasing genetic uniformity of species of food crops—is the single most serious environmental problem. Something must be done to prevent the loss of wild food plants or no-longer-cultivated food plants. Otherwise, the lack of genetic diversity could allow a significant portion of a major crop to be destroyed overnight. In 1970, for example, southern leaf blight destroyed approximately 20 percent of the United States corn crop, leaving very few varieties of corn unaffected in the areas over which the disease had spread. Which of the following can be inferred from the passage above?
选项
A、Susceptibility to certain plant diseases is genetically determined.
B、Eighty percent of the corn grown in the United States is resistant to southern leaf blight.
C、The extinction of wild food plants can in almost every case be traced to destructive plant diseases.
D、Plant breeders focus on developing plants that are resistant to plant disease.
E、Corn is the only food crop threatened by southern leaf blight.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3358358.html
相关试题推荐
So-calledenvironmentalistshavearguedthattheproposedGoldenLakeDevelopmen
Crimesaremainlycommittedbytheyoung,andforthisreasonmerelyincreasing
Hotcooilburners,designedtobeusedinasphaltplants,aresoefficientthat
Thetheorythattheimpactofagiantmeteoritecausedtheextinctionofthedin
Scientistsnowbelievethatartificial-hipimplants,previouslythoughttobesa
Thenumberofpeople85orolderintheUnitedStatesstartedincreasingdramati
UnitedStatesadvertisingagenciesareincreasinglyusinginterviewsatshopping
Extinctionisaprocessthatcandependonavarietyofecological,geographical
Cartelephoneshavebecomeincreasinglypopularbecausetheypermitpeopletoma
Temporary-employmentagenciesbenefitnotonlyfromtheincreasingdemandforcl
随机试题
Howmanypeoplewerehomelessduetotheearthquakeandtsunami?[br][original
[originaltext]Themanagerofalargeofficebuildinghadreceivedmanycomp
Describeacinemaortheatreyouenjoyvisiting.Youshouldsay:whereitisloc
下列植物的结构中,属于果实一组的是( )。A.松子、蚕豆 B.杏仁、花生
隔离开关和接地开关主刀本体同期不合格,试验数据超标,仍可以长期运行,应定性为(
A.0.030 B.0.025 C.0.020 D.0.015
1,1,2,6,24,( )。A.48 B.96 C.120 D.144
不满16周岁的人不管实施何种危害社会的行为,都不负刑事责任,为完全不负刑事责任年
甲公司2019年7月1日发给乙公司商品500件,增值税专用发票注
道路面层的水泥混凝土配合比设计除满足经济性、工作性、耐久性外,还需要满足的指标有
最新回复
(
0
)