首页
登录
职称英语
[originaltext] Consider the fact that crops generally produce several hundre
[originaltext] Consider the fact that crops generally produce several hundre
游客
2024-02-01
72
管理
问题
Consider the fact that crops generally produce several hundred seeds from each plant. By comparison,(19)each weed plant can produce tens or even hundreds of thousands of seeds. And some buried seeds can survive up to forty years or even longer. Eradicating weeds means that you have to remove all the seeds and roots so the plants will not grow back. But birds or the wind can reintroduce them to the land. A more common way to deal with weeds is to control them enough so that the land can be used for planting. Chemical weed killers or natural treatments like corn gluten can suppress weed growth. Dense planting of a crop can also act as a natural control. One of the most common methods for suppressing weeds is dense planting.(20)A dense, competitive crop that quickly shades the soil will help suppress many weeds. The seeds need light to grow, so blocking the sun will reduce weed growth. Animals like sheep or goats eat weeds, so they can provide a biological control. Insects and other organisms can also act as biological controls.(21)Preventing the spread of weeds is an important part of weed management. Farm vehicles should be kept out of areas with weeds. If that is not possible, then clean off the equipment and your shoes when leaving. Another way to make use of weeds is to compost them. Heat is produced in the process of making organically rich compost to improve soil. The heat will kill many weed seeds. The same is true of seeds that pass through animals that graze on weeds.
Questions 19 to 21 are based on the passage you have just heard.
19. How many seeds can each weed plant produce at most?
20. How can dense plantings suppress weeds according to the speaker?
21. How to prevent the spread of weeds?
选项
A、Thousands of seeds.
B、Tens of thousands of seeds.
C、Hundreds of thousands of seeds.
D、Millions of seeds.
答案
C
解析
录音开始就提到,每一棵草都能产生数十万(hundreds of thousands)粒种子,因此C项正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3413911.html
相关试题推荐
[originaltext]Readingisapermanenttopicforthosehighlycivilizedcount
[originaltext]Readingisapermanenttopicforthosehighlycivilizedcount
[originaltext]Americansgetsomeoftheirnewsandentertainmentfrompubli
[originaltext]W:Wow,it’scooloutsideandit’sfreezinginhere!Whyistheai
[originaltext]W:What’syourplanfortheinteriordecorationofthehousewear
[originaltext]W:What’syourplanfortheinteriordecorationofthehousewear
[originaltext]W:What’syourplanfortheinteriordecorationofthehousewear
[originaltext]W:What’syourplanfortheinteriordecorationofthehousewear
[originaltext]W:Ihaveaveryimportantthingtoaskyou.DoyouspeakFrench?
[originaltext]W:Ihaveaveryimportantthingtoaskyou.DoyouspeakFrench?
随机试题
Wateristofish______airistoman.A、thatB、whichC、whatD、howC
[originaltext]W:Howmucharethesepens?M:Theyusedtobe60centseachbut
Theeveningnewscomesonatseveno’clockand______onlythirtyminutes.A、keep
冯·诺依曼提出了存储程序,程序自动控制理论,并首次创立了二进制代数。()
临时用电工程必须经编制、审核、批准部门和使用单位共同验收,合格后方可投人使用。
下列各项中,不能提示病情严重,预后不良的是A.目暗睛迷 B.舌苔骤剥 C.脉
A.发散B.缓急C.收敛D.泄降E.软坚咸味药物的作用是
将5个不同颜色的锦囊放入4个不同的锦盒里,如果允许锦盒是空的,则所有可能的放置方
某股份有限公司董事会作出了一项违反法律的决定致公司损失50万元。经查明,公司董事
施工图审查机构对施工图设计文件审查的内容有()。A.是否符合工程建设强制性标准
最新回复
(
0
)