题目内容 (请给出正确答案)
[主观题]

In Bt cotton fields, some pests replaced the bollworm as the primary pest because ______.A

In Bt cotton fields, some pests replaced the bollworm as the primary pest because ______.

A.their favorite food is Bt cotton

B.the bollworms were killed out by the Bt cotton

C.both their enemies and the bollworm were all killed by Bt cotton

D.people used the pesticides

提问人:网友xie_shun 发布时间:2022-01-06
参考答案
查看官方参考答案
如搜索结果不匹配,请 联系老师 获取答案
更多“In Bt cotton fields, some pest…”相关的问题
第1题
Scientists were embroiled (使卷入) last week in an international row over genetically modi

Scientists were embroiled (使卷入) last week in an international row over genetically modified cotton (GM cotton).

A study in China suggested for the first time that the crop was permanently damaging the environment and that insects were building up resistance to it.

The study, by the Nanjing institute of Environmental Science, combined the laboratory and field work from four Chinese scientific institutes. The study was done over a several - year period.

GM Cotton had a gene resistance to the cotton bollworm (棉铃虫) and isolated from the bacterium (细菌) named Bacillus thuringiensis (Bt), but the study found that it harms the natural parasitic (寄生的) enemies of the cotton bollworm.

It also indicated that populations of pests besides the bollworm had increased in Bt cotton fields and some had replaced the bollworm as the primary pest.

However, the leading GM company, the US's Monsanto, which controls more than 80 per cent of the Bt cotton grown worldwide, dismissed the research.

It said that the industry has always cited GM cotton as its biggest success, because it can increase yields by up to 60 per cent and reduce the need for pesticides (杀虫剂) by 80 per cent.

But, unfortunately for the industry, (80) the scientists also found that the resistance of Bt cotton to bollworm decreased significantly over time.

Why scientists say no to GM cotton?

A.Because the cotton was genetically modified.

B.Because the cotton was found to damage the environment.

C.Because the cotton harms the bollworm.

D.Because Monsanto dismissed the research.

点击查看答案
第2题
The author imply that ______.A.The US's Monsanto agreed with the results of Chinese scient

The author imply that ______.

A.The US's Monsanto agreed with the results of Chinese scientists study

B.GM cotton is an ideal crop

C.The US's Monsanto dismissed the research for its own profit

D.Cotton bollworm has no resistance to Bt cotton over time

点击查看答案
第3题
Text 4In 1960—1961, Chad (乍得) harvested 98,000 tons of cotton for the first time in its

Text 4

In 1960—1961, Chad (乍得) harvested 98,000 tons of cotton for the first time in its history, and put out the flag a little too soon. The efforts of the authorities to get the peasants ' back' to work, as they had slacked off a great deal the previous year during independence celebrations, largely contributed to it. Also, rains were well spaced, and continued through the whole month of October. If the 1961—1962 total is back to the region of 45,000 tons, it is mostly because efforts slackened again and sowing was started too late.

The average date of sowing is about July 1st. ff this date is simply moved up fifteen or twenty days, 30,000 to 60,000 tons of cotton are gained, depending on the year. The peasant in Chad sows his millet first, and it is hard to criticize this instinctive priority given to his ' daily bread'.

An essential reason for his lateness with sowing cotton is that at the time when he should leave to prepare the fields he has just barely sold the cotton of the previous season. The work required to sow, in great heat, is psychologically far more difficult if one's pockets are full of money. The date of cotton sales should therefore be moved forward as much as possible, and purchases of equipment and draught animals encouraged.

Peasants should also be encouraged to save money, to help them through the difficult pealed between harvests. If necessary they should be forced to do so, by having the payments for cotton given to them in installments. The last payment would be made after proof that the peasant has planted before the deadline, the date being advanced to the end of June. Those who have done so would receive extra money whereas the last planters would not receive their last payment until later.

Only the first steps are hard, because once work has started the peasants continue willingly on their way. Educational campaigns among the peasants will play an essential role in this basic advance, early sowing, on which all the others depend. It is not a matter of controlling the peasants.

Each peasant will remain master of his fields. One could, however, suggest the need for the time being of kind but firm rule, which, as long as it cannot be realized 'by the people' , should at least be 'for the people. '

36. In 1960—1961, Chad had a good harvest of cotton because______.

A) the government greatly encouraged peasants

B) rains favored the growth of cotton

C) Chad gained independence in the previous year

D) both A and B

点击查看答案
第4题
听力原文:TEHERAN -- Iran’s Agriculture Minister Issa Kalantari has given a warning of a ha

听力原文: TEHERAN -- Iran’s Agriculture Minister Issa Kalantari has given a warning of a hard year to come because of a drought that is expected to destroy up to 2. S million tons of wheat. Other crops such as cotton, maize and hay, as well as the production of sugar and meat would suffer from the drought. Mr. Kalantari said in a seminar: "Weather conditions in the current crop year have caused the destruction of 2-9. S million tons of wheat and major damage to other fields that depend on rainfall. As far as water is concerned, Iran is going through a crisis this year. The volume of water behind dams is less than 40 per cent to S0 per cent of their capacity."

According to the news, Iran has been suffering from ______.

A.flood

B.dry weather

C.economic crisis

D.food crisis

点击查看答案
第5题
In 1960—1961, Chad(乍得) harvested 98,000 tons of cotton for the first time in its history

In 1960—1961, Chad(乍得) harvested 98,000 tons of cotton for the first time in its history, and put out the flag a little too soon. The efforts of the authorities to get the peasants 'back' to work, as they had slacked off a great deal the previous year during independence celebrations, largely contributed to it. Also, rains were well spaced, and continued through the whole month of October. If the 1961—1962 total is back to the region of 45,000 tons, it is mostly because efforts slackened again and sowing was started too late.

The average date of sowing is about July 1st. ff this date is simply moved up fifteen or twenty days, 30,000 to 60,000 tons of cotton are gained, depending on the year. The peasant in Chad sows his millet first, and it is hard to criticize this instinctive priority given to his 'daily bread'.

An essential reason for his lateness with sowing cotton is that at the time when he should leave to prepare the fields he has just barely sold the cotton of the previous season. The work required to sow, in great heat, is psychologically far more difficult if one's pockets are full of money. The date of cotton sales should therefore be moved forward as much as possible, and purchases of equipment and draught animals encouraged.

Peasants should also be encouraged to save money, to help them through the difficult pealed between harvests. If necessary they should be forced to do so, by having the payments for cotton given to them in installments. The last payment would be made after proof that the peasant has planted before the deadline, the date being advanced to the end of June. Those who have done so would receive extra money whereas the last planters would not receive their last payment until later.

Only the first steps are hard, because once work has started the peasants continue willingly on their way. Educational campaigns among the peasants will play an essential role in this basic advance, early sowing, on which all the others depend. It is not a matter of controlling the peasants.

Each peasant will remain master of his fields. One could, however, suggest the need for the time being of kind but firm rule, which, as long as it cannot be realized 'by the people', should at least be 'for the people.'

In 1960—1961, Chad had a good harvest of cotton because______.

A.the government greatly encouraged peasants

B.rains favored the growth of cotton

C.Chad gained independence in the previous year

D.both A and B.

点击查看答案
第6题
Jazz is Americas contribution to popular music.【C1】______ classical music, which follows f
ormal European traditions, jazz is【C2】______ and free-form. The【C3】______ of this music are as interesting as the music itself. Jazz was【C4】______ by American Negroes, who were brought to the Southern states as slaves. They were sold to plantation owners and forced to work long hours in the cotton and tobacco fields. This work was hard and life was【C5】______. When a Negro died his friends and relatives formed a procession【C6】______ the body to the cemetery. A band often【C7】______ the procession. On the way to the cemetery the band played slow, solemn music suited to the【C8】______. But on the way home the【C9】______ changed. Spirits lifted. Everybody was happy. Death had removed one of their number,【C10】______ the living were glad to be alive. The band played happy music, improvising【C11】______ both the harmony and the melody of the tunes presented at the funeral. This music made everyone want to dance. It was an early form. of jazz. Music has always been important in Negro life.【C12】______ mainly from West Africa, the blacks who were brought to America already【C13】______ a rich musical tradition. This music【C14】______ on religious ceremonies【C15】______ dancing, singing, clapping, and stamping to the【C16】______ of a drum were important forms of musical and rhythmic【C17】______. As these people settled【C18】______ their new life in the plantations of the South, music【C19】______ its importance. In the fields, they【C20】______ work songs. Singing made the hard work go faster.

【C1】

A.Inferior to

B.In contrast to

C.Similar to

D.Superior to

点击查看答案
第7题
听力原文:W: Would you please describe the nature of your farm? M: Sure, I mainly grow feed

听力原文:W: Would you please describe the nature of your farm?

M: Sure, I mainly grow feed crops. Feed crops are crops that are used to feed cattle. The crops that I grow are corn and wheat. I do grow cotton and other when the prices for them are better.

W: How many employees do you have?

M: I have three full-time employees and six to seven part-time employees.

W: Do you pay them hourly or are they salaried?

M: I pay mem by me hour because sometimes they only work a few hours and other times they work many hours. Therefore, it wouldn't be fair for them to get a weekly or monthly salary year round.

W: How many hours do you work as the owner?

M: In the winter I work eight hours a day, but in the spring, summer, and fall I work twelve to fourteen hours a day. Many times a farmer' s work depends on the weather. For example, if the crop need water and it hasn't rained, I must irrigate my fields which can take many hours. At other times, I spend my time in checking my fields for pests. If I find them, I have to apply pesticides. If my machinery breaks down, I have to fix it. Of course, I must also make sure my crops get picked when they are ready.

W: If you were to start a new business this year, what changes would you make?

M: I wouldn't make many changes, and the few changes I would make would be subtle. Right now I am a successful farmer.

What crops does the farmer grow?

A.Cotton every year.

B.Corn and wheat.

C.Rice. .

D.Other things.

点击查看答案
第8题
These medical cotton balls are all ________.
点击查看答案
第9题
Today, she is wearing ________ dress.

A、a pretty white cotton

B、a white pretty cotton

C、a pretty cotton white

D、a cotton pretty white

点击查看答案
第10题
Mary has just bought herself ___________ dress.A.a cotton expensive blueB.an expensive blu

Mary has just bought herself ___________ dress.

A.a cotton expensive blue

B.an expensive blue cotton

C.a blue expensive cotton

D.a cotton blue expensive

点击查看答案
账号:
你好,尊敬的用户
复制账号
发送账号至手机
密码将被重置
获取验证码
发送
温馨提示
该问题答案仅针对搜题卡用户开放,请点击购买搜题卡。
马上购买搜题卡
我已购买搜题卡, 登录账号 继续查看答案
重置密码
确认修改
欢迎分享答案

为鼓励登录用户提交答案,简答题每个月将会抽取一批参与作答的用户给予奖励,具体奖励活动请关注官方微信公众号:简答题

简答题官方微信公众号

警告:系统检测到您的账号存在安全风险

为了保护您的账号安全,请在“简答题”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!

微信搜一搜
简答题
点击打开微信
警告:系统检测到您的账号存在安全风险
抱歉,您的账号因涉嫌违反简答题购买须知被冻结。您可在“简答题”微信公众号中的“官网服务”-“账号解封申请”申请解封,或联系客服
微信搜一搜
简答题
点击打开微信