题干

有人看到别人吃酸杏时,自己也会分泌唾液,这是一种反射现象.下列叙述与这种反射现象特点不相符的是(    )

A:是后天形成的

B:属于低级神经活动

C:可以消退或减弱

D:如图中的①处参与反射的完成

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答案(点此获取答案解析)

B

同类题4

 Just as I came back home. I heard a sound coming from the bedroom upstairs—it was from my favourite violin.

“Thief (小偷)!”

 I rushed upstairs and saw a boy in dirty clothes pulling my violin down. At first sight, I found a new pair of shoes missing. It seemed he was surely a thief.

 However, when I saw his eyes full of fear, my anger disappeared. I smiled and asked, “Are you Mr. Ram’s student Rubens? I'm his butler(男管家). I've heard Mr. Ram say his student will come. It must be you.”

“Has my teacher gone out ?”the boy said, “I think I'd better visit him again in a while/”

 I nodded and asked him, “Do you like playing the violin?”

“Yes, but I'm too poor to afford one.” the boy replied.

“Then, I'll give you this violin." The boy looked at me surprisingly, but he picked up the violin. While going out of the room, he suddenly saw a huge photo of me playing the violin at the Grand Theatre of Sydney on the wall. His face turned pale. He stood there for a moment and ran out. He must have understood what had happened because no master(主人)would put up the butler’s photo on the wall of his living room.

 A few years later, at a music competition in Melbourne, I was invited to be the judge (评委). Finally, a violin player called Merritt won the first prize.

 After the prize-giving, Merritt ran to me holding a violin box, his face red, and asked, “Mr. Brian, do you still know me? You gave me the violin, which I have treasured ever since! Today, I want to say sorry and give back this violin to you without regret…”

 He was just the “Mr. Ram's student”!