(单选题)

What does "fully penetrative" mean in this passage?

A.A healthy lifestyle will spare you from Alzheimer's, even if you are dementia gene carrier.

B.People with Alzheimer's mutations will definitely suffer from this disease.

C.Genetic mutations don't play a decisive role.

D.Your lifestyle will finally determine the chance of disease.

参考答案：B

参考解析：

含义题。这个词组本身是完全渗透的意思，定位文中第11段，这句话意思是：他说，与阿尔茨海默氏症有关的基因中，只有不到5%是完全渗透的，这意味着它们保证你会患上这种疾病。B项：患有阿尔茨海默氏症突变的人肯定会患上这种疾病，表达符合文意。故本题正确答案选B。

知识点：含义题英语阅读理解通用英语