Three experimental fields of seawater rice were harvested in China on Wednesday，a further step toward its future practical use.Also known as saline-alkali tolerant rice（耐鹽堿水稻），the seawater rice is designed to grow in seaside flats or other areas with high salt content and has been developed by experts through crossbreeding（雜交） and other technologies.
One type of seawater rice growing in Qingdao's Chengyang district，Shandong Province，produced 3.9 metric tons（公噸） per hectare（公頃），experts announced.Once widely planted in large areas，the output could be much higher.
The Qingdao Saline-Alkali Tolerant Rice Research and Development Center，led by renowned Chinese agricultural scientist Yuan Longping，was established several years ago.It set itself a three-year target of developing a kind of salt-resistant rice capable of producing 4.5 tons a hectare，which would guarantee growers the minimum acceptable level of profit.The average rice output in China is 6.75 tons a hectare.
Planting in the experimental field in Chengyang district and five other plots of saline-alkali land started at the end of May.The five other plots were in Dongying，Shandong Province；Wenzhou，Zhejiang Province；Yan'an，Shaanxi Province；Kashgar，the Xinjiang Uygur Autonomous Region；and Daqing，Heilongjiang Province.The sites represent actually every type of saline-alkali land in China and researchers aim to grow different kinds of rice able to cope with different climate，salinity and soil structure conditions.
The test crops in Kashgar and Daqing were also harvested on Wednesday.In Kashgar，the output reached more than 7.5 tons per hectare，according to experts' tests，much higher than expected.The harvest in Kashgar was satisfactory.The result means it is possible to plant such salt-resistant rice in southern Xinjiang in the future.Xinjiang has about 2 million hectares of saline-alkali land that have the potential to be planted with salt-resistant rice，and if it is widely planted it will generally improve rice production in the region.
The seawater rice grown in Daqing only produced 3.1 tons per hectare.A live video on Shandong TV showed growers appearing a little disappointed by the result，as they hoped the experts' efforts would increase production greatly.The water and soil conditions of the site were not ideal，and the PH level was extremely high.
（1）Which is the main feature of seawater rice according to the text？ CC
A．It has a shorter growing period.
B．It is a kind of highly productive crop.
C．It can grow in the soil with high salt content.
D．It is the combination of many technologies.
（2）How much rice does a farmer harvest at least to meet the cost？ BB
A．3.9 tons a hectare.
B．4.5 tons a hectare.
C．6.75 tons a hectare.
D．7.5 tons a hectare.
（3）The researchers chose the experimental fields according to BB.
A．the distance between them
B．the type of the soil and climate
C．the local governments' support
D．the local agricultural conditions
（4）What can we infer about the seawater rice from the last paragraph？ AA
A．The seawater rice is not fit for all kinds of saline-alkali soils.
B．It is impossible for the seawater rice to have a good harvest.
C．Growers from Shandong Province were a little disappointed by the result.
D．The output of the seawater rice grown in Daqing is the lowest.
【答案】C；B；B；A
【解答】
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發(fā)布：2024/5/27 14:0:0組卷：31引用：2難度：0.6
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