24. Why did the author bring the tiger cubs home?
- A. To ensure their survival.
- B. To observe their differences.
- C. To teach them life skills.
- D. To let them play with his kids.
答案：A
答案句：Globally, a third of Sumatran cubs in zoos don't make it to adulthood, so I decided to give them round-the-clock care at home.
参考译文：在全球范围内，动物园里的苏门答腊幼虎有三分之一活不到成年，所以我决定在家里给它们提供全天候的照顾。
定位线索：题干“Why did the author bring the tiger cubs home”→答案句“so I decided to give them round-the-clock care at home”；文中“don't make it to adulthood”对应选项A“To ensure their survival”（确保存活）。
解析：题干问作者为什么把虎崽带回家，答案句明确说因为全球三分之一的苏门答腊幼虎在动物园活不到成年，所以作者决定在家全天候照顾它们，即为了确保它们存活，对应A选项。B选项“观察差异”、C选项“教生活技能”、D选项“和孩子们玩”在原文中均无提及，属于无中生有。
25. What do the underlined words “get up to mischief' mean in paragraph 3?
- A. Behave badly.
- B. Lose their way.
- C. Sleep soundly.
- D. Miss their mom.
答案：A
答案句：As they grew more mobile, we let them move freely around the house during the day, but when we were asleep we had to contain them in a large room, otherwise they'd get up to mischief. We'd come down in the morning to find they'd turned the room upside down, and left it looking like a zoo.
参考译文：随着它们变得更加好动，白天我们让它们在房子里自由活动，但当我们睡觉时，我们必须把它们关在一个大房间里，否则它们会捣乱。我们早上下来会发现它们把房间弄得天翻地覆，看起来像个动物园。
定位线索：题干“get up to mischief”→答案句所在句“otherwise they'd get up to mischief”；下文“turned the room upside down, and left it looking like a zoo”对应选项A“Behave badly”（表现糟糕）。
解析：词义题需结合上下文。答案句先提到如果不把虎崽关起来，它们就会“get up to mischief”，紧接着下一句描述早晨发现房间被弄得天翻地覆、像动物园一样，说明该短语意为“捣乱、行为不良”，对应A选项。B“迷路”、C“睡得很香”、D“想念妈妈”均与上下文语境不符，属于无中生有。
26. What did the author think of raising the tiger cubs at home?
- A. Boring.
- B. Tiring.
- C. Costly.
- D. Risky.
答案：B
答案句：Things quickly got very intense due to the huge amount of energy required to look after them. There were some tough times and I just felt extremely tired.
参考译文：由于照顾它们需要耗费大量精力，事情很快变得非常紧张。有些时候很艰难，我只是感到极度疲惫。
定位线索：题干“What did the author think of raising the tiger cubs at home”→答案句“I just felt extremely tired”；文中“extremely tired”对应选项B“Tiring”（累人的）。
解析：题干问作者对在家养虎崽的看法，答案句直接说“I just felt extremely tired”（我感到极度疲惫），说明作者认为这件事很累人，对应B选项。A“无聊”、C“昂贵”、D“危险”在原文中均无直接依据，属于无中生有。
27. Why did the author decide to send Spot and Stripe back to the zoo?
- A. They frightened the children.
- B. They became difficult to contain.
- C. They annoyed the neighbours.
- D. They started fighting each other.
答案：B
答案句：When Spot and Stripe were four months old, they were learning how to open doors and jump fences, and we knew it really was time for them to go.
参考译文：当Spot和Stripe四个月大时，它们正在学习如何开门和跳栅栏，我们知道真的是时候让它们离开了。
定位线索：题干“Why did the author decide to send Spot and Stripe back to the zoo”→答案句“they were learning how to open doors and jump fences, and we knew it really was time for them to go”；文中“learning how to open doors and jump fences”对应选项B“They became difficult to contain”（它们变得难以控制）。
解析：题干问作者为什么把虎崽送回动物园，答案句提到它们四个月大时学会了开门和跳栅栏，说明它们变得难以控制，因此作者决定送走它们，对应B选项。A“吓到孩子”、C“打扰邻居”、D“互相打架”在原文中均未提及，属于无中生有。