Two hundred years ago, giant tortoises lived on Floreana Island in the Galápagos. In the mid-1800s, people hunted them, and soon there were no tortoises left on the island.

Now, they are back. In February, a newspaper reported that nearly 160 young giant tortoises were set free on Floreana Island. These tortoises are relatives of the ones that lived there long ago.

Scientists worked hard for years to make this happen. In 2008, they found some tortoises with Floreana family ties on a nearby island. From these tortoises, scientists raised new ones that are very close to the original Floreana kind.

These young tortoises were born and grew up in a safe place. Then, they were released into the wild on Floreana Island.

1.1.When did people hunt the tortoises on Floreana Island?

A In 2008.

B In February, 2026.

C In the 1850s.

D Two years ago.

解析：选C。C细节理解题。根据文章第一段第二句“In the mid-1800s, people hunted them”可知，人们捕猎这些巨龟的时间是19世纪中期，即19世纪50年代（1850s），因此正确答案为C。

2.2.What does the underlined word “they” in paragraph 2 refer to?

A People.

B Tortoises.

C Islands.

D Reports.

解析：选B。B词意指代题。第二段第一句“Now, they are back.”中的“they”指代前文提到的“giant tortoise”（巨龟），且后文紧接着介绍幼龟被放归岛屿，因此“they”指的是“tortoises”，故B正确。故选B。

3.3.Where did scientists find the related tortoises?

A On a nearby island.

B On Floreana Island.

C In a safe place.

D In the forest.

解析：选A。A细节理解题。根据文章第三段第二句“In 2008, they found some tortoises with Floreana family ties on a nearby island.”可知，科学家是在附近的一座岛屿上找到了与弗洛雷纳岛巨龟有亲缘关系的龟，因此正确答案为A。

4.4.What can we know about the young tortoises?

A They lived in danger before.

B They grew up safely.

C They are the original kind.

D They lived on an island.

解析：选B。B细节理解题。根据文章最后一段第一句“These young tortoises were born and grew up in a safe place.”可知，这些幼龟是在安全的地方出生并长大的，因此B选项“They grew up safely.”正确。A选项“lived in danger”与原文“safe place”矛盾；C选项“the original kind”过于绝对，原文说“very close to the original”；D选项虽提及岛屿，但未明确是幼龟原本生活的地方。故选B。

5.5.What is the main idea of the passage?

A Tortoises return to Floreana.

B Islands change a lot.

C Scientists found new animals.

D Galápagos has many islands.

解析：选A。A主旨大意题。文章开篇讲述弗洛雷纳岛巨龟曾因捕猎灭绝，随后介绍科学家通过努力使近亲龟繁殖并放归该岛，全文围绕“巨龟重返弗洛雷纳岛”展开，因此A选项“Tortoises return to Floreana.”准确概括了文章主旨。其他选项偏离文章核心内容。故选A。