C.400 million.
D.2050 million.
【答案与解析】 B 细节题。由第1段第2、3句可知:到2050年老年痴呆症病人的人数会达到100 million, 也就是现在的4倍,现在的人数就是25 million。
43.What is not the early signs of the Alzheimer's disease according to the passage?
A.Poor memory.
B.Proteins exist in the brain.
C.Trouble with the sense of smell.
D.Less use of the brain.
【答案与解析】 D 细节题。A、B、C三项都是老年痴呆症的早期特征,D项指少用脑只会更容易得老年痴呆症, 而不是它的早期特征。
44.What does the underlined word “it” in Paragraph 1 refer to?
A.Alzheimer's disease.
B.Alzheimer's patients.
C.The cause and cure.
D.The research.
【答案与解析】 A 词义推测题。根据上文和此句的意义可知答案。
45.According to the passage, we can learn that ________.
A.there are no proteins in the brains of the people with no Alzheimer's disease
B.the people who often use their brains will not get Alzheimer's disease
C.researchers and doctors have found ways to cure Alzheimer's disease
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