[不定项选择题]"He looks normal." That′ s what everybody says when I tell them my son was just diagnosed as autism (孤独症). They all say it without exception. It′s true. Alejandro does look like every other 31 boy. He plays, he smiles, and he runs around with the two-year-old boy′ s boundless energy until he is too tired. He laughs when you move your fingers 32 on a sensitive part of his body. And he often plays with his toys like every other young child at his age. But most of the time, Alejandro 33 in his own little world playing with his toys all by himself even in a group of kids and ignoring you when you talk to him loudly. At that time he′s alone, no matter how hard you try to 34 him. My wife and I get 35 .We ask for "nose kisses" or hugs and many times he doesn′t notice us. It′s extremely anxious when your child′s face is right in front of you and he won′t admit your presence. He regularly doesn′t eat. The food often bothers him when he puts it in his mouth. He is very small 36 his age. We are told that it′s another effect of the autism. Because autism isn′t like some other 37 , there is no set treatment. Each child needs to be treated 38 ; what works for one probably doesn′t work for another. Try a treatment. If it doesn′t work, you have to try another39 you hopefully find something that does work. The future is cloudy, but we will try everything we can do to reach him, because we love him and we know he′s a special little boy. And we believe with the help of love, we can 40 any difficulty. 第（39）题选
A.unless
B.when
C.until
D.though