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His decades of effort began to__________ , for his new breed of rice had become more popular.A． pay offB． call offC． pull offD． lay off
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“Salty” Rice Plant Boosts HarvestsBritish scientists are breeding a new generation of rice plants that will be able to grow in soil containing salt water. Their work may enable abandoned farms to become productive once more.Tim Flowers and Tony Yeo,from Sussex University's School of Biological Sciences,have spent several years researching how crops,such as rice,could be made to grow in water that has become salty.The pair have recently begun a three-year programme,funded by the Biotechnology and Biological Sciences Research Council,to establish which genes enable some plants to survive salty conditions. The aim is to breed this capability into crops,starting with rice.It is estimated that each year more than 10m hectares（公顷）of agricultural land are lost because salt gets into the soil and stunts（妨碍生长）plants. The problem is caused by several factors. In the tropics , mangroves（红树林）that create swamps（沼泽）and traditionally formed barriers to sea water have been cut down .In the Mediterranean,a series of droughts have caused the water table to drop,allowing sea water to seep（渗透）in. In Latin America , irrigation often causes problems when water is evaporated（蒸发）by the heat , leaving salt deposits behind.Excess salt then enters the plants and prevents them functioning normally.Heavy concentrations of minerals in the plants stop them drawing up the water they need to survive.To overcome these problems,Flowers and Yeo decided to breed rice plants that take in very little salt and store what they do absorb in cells that do not affect the plants' growth.They have started to breed these characteristics into a new rice crop,but it will take about eight harvests before the resulting seeds are ready to be considered for commercial use.Once the characteristics for surviving salty soil are known,Flowers and Yeo will try to breed the appropriate genes into all manners of crops and plants.Land that has been abandoned to na- ture will then be able to bloom again,providing much needed food in the poorer countries of the world. Flowers and Yeo have started a program______.A: to find ways to prevent water pollutionB: to identify genes that promote growth in salty soilC: to breed rice plants that taste saltyD: to find ways to remove excessive salt from soil
考题
在编制医药商品购进计划时，要根据消费情况选择品种，通常将医药商品划分为哪几类：（）A、高档品种、中档品种、低档品种、赠送品种B、畅销品种、平销品种、滞销品种、特殊品种C、大宗品种、一般品种、零星品种、急需品种D、常用品种、次常用品种、少用品种、极少用品种
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单选题In context, which word or phrase is best inserted at the beginning of sentence 4 to connect it with the rest of the paragraph?A
To breed them,B
Although,C
And,D
To protect them,E
Additionally,
考题
单选题在编制医药商品购进计划时，要根据消费情况选择品种，通常将医药商品划分为哪几类：（）A
高档品种、中档品种、低档品种、赠送品种B
畅销品种、平销品种、滞销品种、特殊品种C
大宗品种、一般品种、零星品种、急需品种D
常用品种、次常用品种、少用品种、极少用品种
考题
单选题A farmer imported several fine long wool Tomney sheep from Australia to breed with his Debouittet sheep in hopes of increasing the value of the flock’s wool. This is an example of ______.A
pure-breedingB
crossbreedingC
reproducingD
cloning
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配伍题肾细胞癌可出现（）。|阑尾类癌来自（）。|霍奇金淋巴瘤可出现（）。A印戒细胞BReed-Stemberg细胞C透明细胞D组织细胞E嗜银细胞
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