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【判断题】
若流感病毒的血凝素和神经氨酸酶变异幅度大，形成一个新的亚型，属于质变，由于人群对新亚型的流感病毒普遍缺乏免疫力，因此，往往引起较大规模的流行，甚至世界性大流行。A.
正确
B.
错误
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A.
somewhere relaxing
B.
somewhere relaxed
C.
relaxing somewhere
D.
relaxed somewhere
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A.
It may lead to sharp decline in thinking.
B.
It relates to Alzheimer's disease in some way.
C.
It is the earliest sign of chronic distress.
D.
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A.
refreshed; relaxed
B.
refreshing;relaxing
C.
refreshed; relaxing
D.
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