问题
填空题
专家指出，现在物种灭绝速度急剧增加，这主要是由于 ，物种一旦灭绝，便不可 。
答案
人类活动、再生
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专家指出，现在物种灭绝速度急剧增加，这主要是由于 ，物种一旦灭绝，便不可 。
人类活动、再生
As we get older, the fear of not having a good memory grows for many people. A lot of people 48 that the loss of memory can be the sign of Alzheimer’s(老年痴呆症). It is true that as we grow older we are more 49 to develop Alzheimer’s. But with a proper lifestyle that includes a balanced diet and exercise, one can stay mentally 50 into their old age. There are many causes of memory loss that have nothing to do with Alzheimer’s. As researchers come 51 to understanding Alzheimer’s, the outlook(前景) is 52 for people with this illness. New treatments are becoming available. With improved diagnosis(诊断), medications and treatment, one day we may be able to 53 or even reverse (反转) memory loss as we age. Memory loss is 54 a topic of concern for people. Having Alzheimer’s can lead to increased dependency on others. Not being able to manage basic daily 55 on your own or even not being able to recognize family members would be a serious hit to anyone. This is why many elderly people often have questions and concerns.
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