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
57
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、Dense plantings compete light with weeds.
B、Dense plantings compete air with seeds.
C、Dense plantings compete nutrition with seeds.
D、Dense plantings compete space with seeds.
答案
A
解析
录音中提到,密植可以抑制杂草生长,因为杂草生长需要阳光,而密植可以遮蔽太阳,减少杂草得到的阳光。
转载请注明原文地址:https://tihaiku.com/zcyy/3413912.html
相关试题推荐
[originaltext]TraditionalAmericansummercampsofferyoungpeopleachance
[originaltext]TraditionalAmericansummercampsofferyoungpeopleachance
[originaltext]Readingisapermanenttopicforthosehighlycivilizedcount
[originaltext]Americansgetsomeoftheirnewsandentertainmentfrompubli
[originaltext]Americansgetsomeoftheirnewsandentertainmentfrompubli
[originaltext]W:Wow,it’scooloutsideandit’sfreezinginhere!Whyistheai
[originaltext]W:Wow,it’scooloutsideandit’sfreezinginhere!Whyistheai
[originaltext]W:What’syourplanfortheinteriordecorationofthehousewear
[originaltext]W:What’syourplanfortheinteriordecorationofthehousewear
[originaltext]W:Ihaveaveryimportantthingtoaskyou.DoyouspeakFrench?
随机试题
Nike’sSuccessNikeperformedwellduringthelastquarter.Businesswasupi
Designingforsustainability:whatarethechallengesbehindgreenmater
现代教育的特点。
在国际法的正式国际关系中,最为重要、最具有决定意义的基本行为主体是()。A.政治
A.维生素B B.维生素B C.维生素B D.泛酸 E.维生素PPNAD
肺癌最常见的症状为A.胸闷或胸痛 B.咳嗽 C.血痰 D.气促 E.发热
A.1/5~1/4B.3/4-1C.1/4~1/3D.2/3~1E.1/7~1/
()kV及以上GIS室吊装平台大门宜采用电动卷帘门,并充分考虑抗风能力,高度、宽
下列业主的共同决定事项中,属于应当经专有部分占建筑物总面积三分之二以上的业主且占
Ⅰ期子宫内膜癌患者的治疗首选( )。A.手术治疗 B.化学治疗 C.放射治
最新回复
(
0
)