Part of Tuz Golu, also known as the "Salt Lake" in Aksaray, Turkey, turns bright red due to a higher population of algae（海藻）.

Imagine that you're heading out to the beach on a beautiful summer day. The sun is shining. The sand feels warm and inviting on your bare feet. The water is as red as the blood in your veins.

If you find yourself in such a setting, don't panic. You're probably just vacationing in Aksaray, Turkey, where the country's second-largest lake, Tuz Golu, also known by the locals as "Salt Lake," turns bright red due to an interesting anomaly that occurs every summer.

Christopher Gobler, a research professor in a university, New York, told that a species of algae called Dunaliella salinas is responsible for the lake's red color.

Gobler says that when the water is sucked out of the lake due to evaporation, it raises the salt level and kills off a large portion of the plankton（浮游生物）that eat the color-changing algae in the lake. The algae's population grows and causes the water to change to its bright red color.

The lake will retain its strange color until all of the water evaporates sometime in August, leaving behind a dry salt pan. The lake will then fill up with water again during the winter.

Tuz Golu isn't the only body of water in the world with an unusual color, Laguna Colorada in Uyuni, Bolivia, has a lake that turns red in the summer in a similar cycle to Tuz Golu. Lake Hillier located in western Australia has waters that are bright pink. 

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1.Where is the Salt Lake?

A In Turkey.

B In Bolivia.

C In Australia.

D In America.

解析：选A。A 细节理解题。根据文章第1段第1句Part of Tuz Golu, also known as the "Salt Lake" in Aksaray, Turkey...可知。

2.The color of the lake is_______in summer in Aksaray.

A pink

B white

C red

D blue

解析：选C。C 细节理解题。根据文章第2段第4句The water is as red as the blood in your veins. .可知。

3.What does Christopher Gobler do?

A A teacher.

B A professor.

C A worker.

D A doctor.

解析：选B。B 细节理解题。根据文章第4段第1句Christopher Gobler, a research professor in a university, New York...可知。

4.What makes the lake change the color?

A The algae.

B The plankton.

C The water.

D The sun.

解析：选A。A 细节理解题。根据文章第5段第2句The algae's population grows and causes the water to change to its bright red color..可知。

5.What's the best title for the passage?

A The country Turkey

B How to travel in Turkey

C Lake in Turkey turns blood red

D The color-changing algae

解析：选C。C 主旨大意题。 从文章第1段第1句Part of Tuz Golu, also known as the "Salt Lake" in Aksaray, Turkey, turns bright red due to a higher population of algae.可知这是文章的主题句。