[单项选择]It might take only the touch of peach fuzz to make an autistic child howl in pain. The odour of the fruit could be so Overpowering that he gags. For reasons that are not well understood, people with autism do not integrate all of their senses in ways that help them understand properly what they are experiencing. By the age of three, the signs of autism-- infrequent eye contact, over-sensitivity or under-sensitivity to the environment, difficulty mixing with others are in full force. There is no cure; intense behavioural therapies serve only to lessen the symptoms.
The origins of autism are obscure. But a paper in Brain, a specialist journal, casts some light. A team headed by Marcel Just, of Carnegie Mellon University, and Nancy Minshew, of the University of Pittsburgh, has found evidence of how the brains of people with autism function differently from those without the disorder.
Using a brain-scanning technique called functional magnetic-resonance imaging (FMRI), Dr. Just,
A. The smell of a peach can make an autistic person feel painful.
B. Autistic persons have difficulty understanding their environment.
C. The signs of autism begin to appear after the age of three.
D. Behavioural therapies can be used to cure people of autism.