题目

By the way, did you know that this is because you become addicted in three different ways? First, you can become 【1】 addicted to nicotine, which is one of the hundreds of 【2】 in cigarettes. This means that after a while your body becomes 【3】 to having nicotine in it. So when the drug leaves your body, you get withdrawal 【4】. I remember feeling bad-tempered and sometimes even in pain. Secondly, you become addicted 【5】 habit. As you know, if you do the same thing over and over again, you begin to do it 【6】. Lastly, you can become 【7】 addicted. I believed I was happierHere______ two photos of my family.     [     ]A. is    B. am    C. are    D. be