【单选题】

If you think you are sick, you are sick no matter what anyone else says. On the other hand, if you have belief in your (21) ,and if he tells you that you’re going to feel better, you (22) will take the case (病症)of Mrs.Brown for example. She was (23) to get to sleep at night. She lacked(缺少) energy and was too (24) during the day even for the simple thing that she used to (25) . Occasional headaches, which were becoming more frequent (频繁的), (26) reading or watching TV. The more she thought about her condition, (27) she felt. (28) ,she went to see her doctor, (29) she had known for years. The doctor listened to her complaints(诉说) and gave her a (30) thorough examination. Then, he said to her," There is (31) seriously wrong with your physical condition, but I (32) the fact that you don’t feel well. I am going to give you some pills(药丸) that should (33) . I want you to take one after dinner and (34) a half hour before going to bed to night.Call me tomorrow and tell me (35) ."

The next morning Mrs.Brown telephoned to say, "Doctor, it’s very nice of you. I had the first (36) night’s sleep last night in two months. (37) in those pills "
The doctor said," It’s an old formula(方子) I (38) for years, Just (39) taking them for a week. "Turning to his nurse, he said, "It’s (40) what a little soda(苏打片)can do.\
A、necessary B、wonderful C、important D、harmful