56. How can Cider Cottage be described as?
A. Unique, attractive and well-designed.
B. Suitable, mysterious and well-located.
C. Relaxing, convenient and well-furnished.
D. Practical, comfortable and well-managed.
57. According to the information given, Cider Cottage is ______.
A. in the center of town
B. far away from the seaside
C. for sale at the moment
D. suitable for a family of five
B
Scientists are debating how to limit their newly-discovered power to change genetic structure (结构). Scientists already modify the genes of farm animals and agricultural plants to make them more productive or stronger. But now they can also change genes in wild animals and plants. These genes would continue into later generations. For example, it may be possible for scientists to remove from existence the kind of mosquitoes, small flying insects, that carry the Zika virus. They might also be able to permanently remove species of plants and animals that are damaging to other species.
In a report published last week, the U. S. National Academies of Sciences, Engineering and Medicine (NAS) said it supports continued research on this kind of gene control. But it warned that it is not possible to know what will happen when these changed plants and animals are released into the wild.
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