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Reading comprehension -TOEFL- Lesson 122 (Đọc hiểu -TOEFL- Bài 122)

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Algae is a primitive form of life, a single-celled or simple multiple-celled organism that is able to conduct the process of photosynthesis. It is generally found in water but can also be found elsewhere, growing on such surfaces as rocks or trees. The various types of algae are 5 classified according to pigment.

Blue-green algae, or Cyanophyta, can grow at very high temperatures and under high-intensity light. This type of algae is the oldest form of life with photosynthetic capabilities. Fossilized remains of 10 blue-green algae more than 3.4 billion years old have been found in parts of Africa.

Green algae, or Chlorophyta, is generally found in fresh water. It reproduces on the surfaces of enclosed bodies of water such as ponds 15 or lakes and has the appearance of a fuzzy green coating on the surface of the water.

Brown algae, or Phaeophyta, grows in shallow, temperate water. This type of algae is the largest in size and is most recognizable 20 as a type of seaweed. Its long stalks can be enmeshed on the ocean floor, or it can float freely on the ocean's surface.

Red algae, or Rhodophyta, is a small, delicate organism found in the deep waters of the subtropics. This type of algae has an essential role 25 in the formation of coral reefs: it secretes lime from the seawater to foster the formation of limestone deposits.

1. What is the author's main purpose?




2. Which of the following is NOT true about algae?




3. The word "pigment" at the end of the first paragraph means




4. Algae remnants found in Africa are




5. Green algae is generally found




6. Brown algae would most likely be found




7. According to the passage, red algae is




8. It can be inferred from the passage that limestone deposits serve as the basis of





Grammar Easy Grammar Medium Grammar - Difficult
1->25 26->49 50->75 76->99 100->125 126->164
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