M: Ok, I get it. So if the scientists can figure out what makes the specialized cells work, maybe they can find a way to make sure the second group of cells completely fills the hole in the bone tissue every time. Thatll prevent the disease from ever occurring.
Questions 22 to 25 are based on the conversation you have just heard.
22. What is the conversation mainly about?
23. What is the function of the first group of specialized cells discussed in the conversation?
24. What does the woman say about scientists who study the specialized cells in human bones?
25. According to the man, what is one important purpose of studying specialized cells in human bones?
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre.
Passage One
I had spent my last day in London visiting friends, taking pictures, and doing some last-minute shopping. Among other things, I had bought some presents: a shirt for my brother, a wool blanket for my sister, and a battery-powered alarm clock for my father.
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