单选题
英语六级
2017-03-11
A．It develops more easily in centenarians not actively engaged.
B．It is now the second leading cause of death for centenarians.
C．It has had no effective cure so far.
D．It calls for more intensive research.
参考答案
B
答案解析
What does the speaker say about Alzheimer’s disease?
B。短文中提到，到2014年，美国百岁老人这一群体中，老年痴呆症引起的死亡率增加了两倍多——由3．8％上升到8．5％，这使得这一逐渐严重的大脑疾病成为导致百岁老人死亡的第二大病因，故答案为B。
B。短文中提到，到2014年，美国百岁老人这一群体中，老年痴呆症引起的死亡率增加了两倍多——由3．8％上升到8．5％，这使得这一逐渐严重的大脑疾病成为导致百岁老人死亡的第二大病因，故答案为B。
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