Câu hỏi:
12/10/2021 2,618Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question
Coral reefs are some of the most diverse ecosystems in the world, housing tens of thousands of marine species. With their hardened surfaces, corals are sometimes mistaken as being rocks. And, because they are attached, “taking root” to the seafloor, they are often mistaken for plants. However, unlike rocks, corals are alive. And unlike plants, corals do not make their own food. Corals are in fact animals. Appearing as solitary forms in the fossil record more than 400 million years ago, corals are extremely ancient animals that evolved into modern reef-building forms over the last 25 million years.
Coral reefs are the largest structures on earth of biological origin. Coral reefs are unique and complex systems. Rivaling old growth forests in longevity of their ecological communities, well-developed reefs reflect thousands of years of history.
Corals are ancient animals related to jellyfish and anemones. The branch or mound that we often call “a coral” is actually made up of thousands of tiny animals called polyps. A coral polyp is an invertebrate that can be no bigger than a pinhead to up to 30 centimeters (1 foot) in diameter. The polyps extend their tentacles at night to sting and ingest tiny organisms called plankton and other small creatures. Each polyp has a saclike body and a mouth that is encircled by stinging tentacles. The polyp uses calcium carbonate (limestone) from seawater to build a hard, cup-shaped skeleton. This skeleton protects the soft, delicate body of the polyp.
Reefs only occur in shallow areas that are reachable by sunlight because of the relationship between coral and algae. Various types of microscopic algae, known as Symbiodinium, live inside of the coral, providing them with food and helping them to grow faster.
There are over 2,500 kinds (species) of corals. About 1,000 are the hard corals that build coral reefs. Other corals are soft corals. Soft corals have skeletons that are flexible and can bend with the water. The three main types of coral reefs are fringing reefs, barrier reefs, and coral atolls. The most common type of reef is the fringing reef. This type of reef grows seaward directly from the shore. They form borders along the shoreline and surrounding islands. When a fringing reef continues to grow upward from a volcanic island that has sunk entirely below sea level, an atoll is formed. Atolls are usually circular or oval in shape, with an open lagoon in the center. Any reef that is called a barrier reef gets its name because its presence protects the shallow waters along the shore from the open sea. That protection promotes the survival of many types of sea plant and animal life.
(Adapted from http://justfunfacts.com)
Which of the following could best reflect the main purpose of the author in the passage?
Sách mới 2k7: 30 đề đánh giá năng lực DHQG Hà Nội, Tp. Hồ Chí Minh, BKHN 2025 mới nhất (600 trang - chỉ từ 140k).
Quảng cáo
Trả lời:
Đáp án B
Kiến thức : Đọc hiểu
Giải thích: Câu nào sau đây thể hiện chính xác nhất mục đích chính của tác giả trong bài đọc?
A. Nhằm chứng minh rằng dải san hô ngầm là động vật.
B. Để cung cấp các thông tin thật về dải san hô ngầm.
C. Để giải thích rằng dải san hô ngầm là hệ sinh thái đa dạng nhất dưới đại dương.
D. Để phân biệt dải san hô ngầm và các động vật khác.
Căn cứ vào thông tin toàn bài:
Bài đọc cung cấp cho chúng ta toàn bộ thông tin về loài san hô, từ cấu tạo (đoạn 2, 3), nơi sinh sống (đoạn 4) và các loại san hô (đoạn cuối)
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions
_______you study for these exams,_______you will do
Câu 2:
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions
Television can make things memorable for the reason that it presents information ________ an effective way
Câu 3:
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions
If you don't have anything ________ to say, it's better to say nothing
Câu 4:
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions
He decided to withdraw from the powerboat race as he had a (n) ________ of danger
Câu 5:
Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions
Peter moved abroad for a fresh start. He regrets it now
Câu 6:
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions
The storm did a lot of ________to our village. All the crops were drastically destroyed and many houses were washed away
Câu 7:
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions
Her husband bought her ______ when he went on holiday in Singapore last week
về câu hỏi!