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Some chimpanzees (黑猩猩) lived in science labs before. Now they live free and happy lives at the Second Chance Chimpanzee Refuge (庇护所) in Liberia. There, they get special care for the rest of their lives.

Long ago, people took the chimpanzees from the wild when they were very young. They lived in testing rooms for many years. Today, they live in big family groups on green islands. They can run, climb trees, and play freely there every day.

These West African chimpanzees are in great danger. Their numbers are decreasing fast, so we must protect them. At the refuge, animal doctors take good care of their health. They give the chimpanzees full health checks, such as blood tests and X-rays. They also check their bones and how well they can move.

Workers there say these health checks are very useful. They help the chimpanzees find health problems early. They also show how strong the old chimpanzees’ bones are. This helps them stay healthy and live more comfortably.

1.1.Where did the chimpanzees live in the past?

A On green islands.

B In science labs.

C At a refuge.

D On African farms.

解析：选B。B 细节理解题。第一段明确说“Some chimpanzees lived in science labs before”，第二段又说“They lived in testing rooms for many years”，说明它们过去住在科学实验室/测试室里。A和C是它们现在在庇护所、绿色岛屿上的生活；D文中没有提到。因此选B。

2.2. What can the chimpanzees do on the green islands?

A Live in testing rooms.

B Work in science labs.

C Stay with young people.

D Move around freely outdoors.

解析：选D。D 细节理解题。第二段说“They can run, climb trees, and play freely there every day”，其中there指代前文的green islands，说明它们可以在户外自由活动。A是过去在测试室的生活；B是过去在科学实验室的生活；C文中没有说它们和年轻人待在一起。因此选D。

3.3. What does the underlined word “decreasing” in Paragraph 3 mean?

A Going up.

B Coming from.

C Taking up.

D Going down.

解析：选D。D 词义猜测题。第三段说这些黑猩猩“in great danger”，而且数量“decreasing fast, so we must protect them”，需要保护说明数量在快速下降。A“上升”与危险、需要保护的语境相反；B“来自”和C“占据、开始从事”与数量变化无关。因此选D。

4.4. What can we learn about the health checks?

A They make old bones stronger.

B They help chimpanzees live better.

C They stop all health problems.

D They are only for young chimpanzees.

解析：选B。B 推理判断题。第四段说健康检查帮助黑猩猩尽早发现健康问题，也能显示老年黑猩猩骨头有多强壮，进而“helps them stay healthy and live more comfortably”，可以推断健康检查帮助黑猩猩生活得更好。A把“检查骨头强度”误解为“让骨头更强”；C“stop all health problems”太绝对；D“only for young chimps”与文中检查老年黑猩猩骨头相矛盾。因此选B。

5.5. What is the passage mainly about?

A Chimpanzees enjoy better lives now.

B How chimpanzees lived in labs.

C Why chimpanzees left the wild.

D Where chimpanzees come from.

解析：选A。A 主旨大意题。全文首段点明黑猩猩以前住在科学实验室，现在住在庇护所，过着自由快乐的生活并得到终身照顾；后文围绕绿色岛屿生活、保护和健康检查展开，说明它们现在生活更好了。B只讲过去在实验室，C“为什么离开野外”不是文章重点，D“来自哪里”只是背景信息。因此选A。