About 33% babies will get dementia(痴呆) when they become old. When people get dementia, their brain don’t work again. People start to forget things. They get angry or sad easily. They don’t know what they want to do. This is a big problem. There is nothing to stop dementia. We must do our best to find something helpful.

   A doctor said: "More people will get dementia in the future if we don’t do anything now." He said it was a big challenge（挑战） and we must find ways to stop it. Many people all over the world have dementia. About 10% of us will get it. This number will go up（上升） as we live longer（更长）.

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1._____babies will get dementia when they grow old.

A About 30%.

B About 33%.

C About 50%.

D About 80%.

解析：选B。细节理解题。根据第1段第1句可知大约是33%左右的婴儿在长大变老后会患老年痴呆症，故选B。

2.Which is NOT about dementia?

A Forget things.

B Easily become sad.

C Kill families.

D Easily become angry.

解析：选C。综合理解题。文中并没有提到患老年痴呆症的人会杀人，故选C。

3.Who is easy to get dementia?

A A baby.

B A boy.

C A young woman.

D An old man.

解析：选D。判断推理题。根据文章内容可知，痴呆症患者基本上都是老年人，故选D。

4.Which is RIGHT?

A Only British people get dementia.

B Only 10% of us will get dementia.

C There is no way to stop dementia now.

D People with dementia know how to go home.

解析：选C。细节理解题。根据第1段倒数第2句There is nothing to stop dementia.可知，故选C。容易武宣B选项，注意第二段倒数第1句：我们越是长寿，患痴呆症的可能性就越大，可知数据并不只是保持在10%。

5.You can read this passage in a_______.

A medical magazine

B story book

C music book

D sports magazine

解析：选A。文章出处题。本文主要内容为有关老年痴呆症的话题，所以更可能出自一本医疗杂志，故选A。