四、阅读理解。
Holmes and I left the old house and walked to the village and paid for a room in Crown Hotel. As we sat waiting in the room until night, Holmes asked me if I had noticed anything strange in the rooms.
“The fake（假的） bell rope for one thing,” I said.
“Yes. And I knew that before we left Baker Street, we should find a ventilator（换气扇）,” he said.
“How, Holmes? That's amazing!” I shouted.
“Not really. Helen Stoner said that her sister could smell the smoke from Dr Roylott, so I knew there had to be a hole of some kind between the two rooms.”
“Of course,” I said. “But how does that help to solve the mystery of her death?”
“Think, Watson. A fake bell rope and a meaningless ventilator were put in the room at the same time, and soon after a woman died in the room.”
“It is certainly a strange coincidence（巧合）,” I said.
“Watson, it's not a coincidence at all. And did you notice that the bed in the room is fixed to the floor? It cannot be moved. Have you ever seen a bed fixed to a floor like that?”
I had to agree that I had not.
“There is a great danger here, Watson,” Holmes went on. “The doctor is a man, and he is planning to commit another crime. We must wait for developments.”
1. Who died in this mystery?
A. Holmes.
B. Watson.
C. Dr Roylott.
D. Helen Stoner's sister.
2. 新考法组合选择 Which of the following are considered as important clues?
① the fake bell rope ② the ventilator
③ the bed fixed to the floor
A. ①②
B. ②③
C. ①③
D. ①②③
3. What can be inferred from the story?
A. Watson didn't believe in coincidence at all.
B. The doctor had committed a crime before and would do again.
C. Holmes thought the crime had nothing to do with the ventilator.
D. Watson noticed the strange bed as soon as he arrived at the scene.

D ; D ; B