填空题

【参考答案】

Tobacco and alcohol
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填空题
Information About the Passage Daily, moderate drinking could almost ______ the risk of developing Alzheimer’s disease or other types of dementia, according to a new research. (1) The study, published this week in The Lancet Medical Journal, also finds that it doesn’t seem to matter what people drink-the effect is the ______. (2) The adverse effect of excess alcohol is beyond ______. (3) Dementia is often caused by a ______ vessel problem. (4) Acetylcholine is a brain chemical believed to facilitate learning and ______. (5)
单项选择题
How many stripes were there on American flag after 1817（）

A. 13.
B. 15.
C. 17.
D. 20.
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