[单项选择] Genetic engineering holds great potential payoffs for farmers and consumers by making crops resistant to pests, diseases, and even chemicals used to kill surrounding weeds. But new research raises concerns that altering crops to withstand such threats may pose new risks from none other than the weeds themselves. This is due to the weeds ability to acquire genes from the neighboring agricultural crops. Researchers found that when a weed cross-breeds with a farm-cultivated relative and thus acquires new genetic traits possibly including artificial genes engineered to make the crop hardier the hybrid weed can pass along those traits to future generations. "The result may be very hardy, hard-to-kill weeds," said Allison Snow, a plant ecologist at Ohio State University in Columbus who conducted the experiments over the past six years along with two colleagues. They presented their results last week at the annual meeting of the Ecological Society of America in Madison, Wisconsin.
A. cross-breeding is a natural process
B. hybrids are generally more successful at breeding than natural plants
C. gene movement between cultivated plants and wild ones is inevitable
D. new research shows that genetically-modified plants are likely to develop into weeds

最新试题

• ●    该病治法为
• ●    [简答题]与阿司匹林比较，对乙酰氨基酚在作用与应用方面有何特点？
• ●    气阀是往复式压缩的主要部件，它主要由（）和将它们组合成一体的螺栓、螺母组成。
• ●    [判断题]旅客免费携带的物品，每件物品外部尺寸长、宽、高之和不超过200厘米。
• ●    [判断题]根据室内火灾温度随时间的变化特点，将建筑火灾发展过程分成初起、成长发展、猛烈、衰减四个阶段
• ●    吸气性呼吸困难的特点是