The changes possibly caused by the cellphones are mainly concerned with ______.
A. the mobility of the mind and the body
B. the smallest units of the brain
C. the arteries of the brain
D. the resident memory
* Đáp án
B
* Hướng dẫn giải
Đáp án B Giải thích: “On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones”. Brain cells = the smallest units of the brain: tế bào não