Read 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?
A. To prove that coral reefs are animals.
B. To provide the facts about coral reefs.
C. To explain that coral reefs are the most diverse ecosystems in the ocean.
Giải bởi Vietjack
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).
Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question.
Vietnam’s population is ageing quickly. In 2017, more than 10 per cent of the population will be 60 and older, and in 15-20 years the elderly will account for one third of the total population. This raises concerns about healthcare, welfare and pensions for the elderly at a time when Vietnam is focusing on economic integration and requires a large labor force. So far two solutions have been proposed: to loosen the two-child policy and to increase the retirement age to 58 for women and 62 for men. By ending the two-child policy the government expects to make up for the ageing population within the next 20 years. But its effect could be creating an uncontrollable boom in the Vietnamese population. When the government loosened the two-child policy in 2015 in a trial period, in the first 6 months of 2016 the third child birth rate increased remarkably by 7.5 per cent
Raising the retirement age has been proposed by the Ministry of Labor pending parliamentary evaluation in May 2017. While the policy is beneficial in utilizing the work experience of the elderly while creating savings in the pension budget, it also means fewer job prospects and promotion opportunities for younger generations. It is also not in the interest of all the elderly, especially the 70 per cent of Vietnam's labor force working in manual labor-intensive sectors such as agriculture, manufacturing and construction where working above the age of 50 can be dangerous and unproductive. Despite these drawbacks, raising the retirement age is still considered by policymakers as one of the key solutions to the ageing population problem in Vietnam. However, these are only temporary solutions.
The best title for this passage could be ________.
Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks.
The first thing that is included in the "living together” (26) ________ is the expected good relations with your family. This also involves sharing equally the housework. (27) ________of people think that everyone should share the housework equally, but in many homes parents do most of it. To certain minds, many families can't share the housework whereas they should try it. In fact, sharing the housework equally is not very possible because of the families' timetable. So, it is somehow believed that children and parents must do things together. For this they can establish a housework planning.
(28) ________, housework's contributions of the teenager make him more responsible. He will think that he has an important role in his family. According to researchers, teenagers should share the housework because (29) ________ will help them when they have to establish their own family in the future. Too many teenagers and young adults leave home without knowing how to cook or clean, but if parents delegate basic housework to teens as they are old enough to do it, they won't be destabilized by doing the housework in their new grown-up life.
It can be (30) ________concluded that many parents don't really prepare their children for future, because they don't stimulate them to learn how to run a house. If parents get them responsible, teens will be more responsible and that will improve family's life.
(Source: https://www.sciencedaily.com/releases/2013)
He decided to withdraw from the powerboat race as he had a (n) ________ of danger.
If you don't have anything ________ to say, it's better to say nothing.
Which statement is probably TRUE according to the information in the paragraph 1?
The storm did a lot of ________to our village. All the crops were drastically destroyed and many houses were washed away.
The word “solitary” in paragraph 1 could be best replaced by ________.
Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of the primary stress in each of the following questions.
Modern office buildings have false floors under which computer and phone wires can be lain.
Tom may get into hot water when driving at full speed after drinking wine.
Mark the letter A, B, C, or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.
According to the passage, the following are true about coral reefs, EXCEPT ________.
