Đáp án B
Khi which thay thế cho situation thì trạng từ đi cùng nó phải là in.
Dịch: Tuyệt chủng có nghĩa là một trạng thái mà trong đó một loài cây, một loài động vật hoặc là một cách sống nào đó, vv ... dừng việc tồn tại
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Extinction means a situation _______ a plan, an animal or a way of life etc … stops existing.
A. to which
B. in which
C. on which
D. for which
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Extinction means a situation ______ a plant, an animal or a way of life stops existing.
A. to which
B. for which
C. on which
D. in which
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
_____________ species are plant and animal species which are in danger of extinction.
A. Dangerously
B. Endangered
C. Endanger
D. Dangerous
Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions
Fertilizer, (A) which is added to the soil to replace or (B) increase plant nutrients, (C) include animal and green manure, fish and bone meal and (D) compost.
A. which is
B. increase
C. include
D. compost
Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
Fertilizer, which is added to the soil to replace or increase plant nutrients, include animal and green manure, fish and bone meal and compost.
A. which is
B. increase
C. include
D. compost
Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions.
Fertilizer, which is added to the soil to replace or increase plant nutrients, include animal and green manure, fish and bone meal and compost.
A. which is
B. increase
C. include
D. compost
Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42.
Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed. Although bioluminescence is a relatively complicated process, it can be reduced to simple terms. Living light occurs when luciferin and oxygen combine in the presence of luciferase. In a few cases, fireflies the most common, an additional compound called ATP is required.
The earliest recorded experiments with bioluminescence in the late 1800s are attributed to Raphael Dubois, who extracted a luminous fluid from a clam, observing that it continued to glow in the test tube for several minutes. He named the substance luciferin, which means “the bearer of life”. In further research, Dubois discovered that several chemicals were required for bioluminescence to occur. In his notes, it was recorded that a second important substance, which he called luciferase, was always present. In later study of small, luminous sea creatures, Newton Harley concluded that luciferin was composed of carbon, hydrogen, and oxygen, which are the building blocks of all living cells. He also proved that there are a variety of luciferin and luciferase, specific to the plants and animals that produce them.
Much remains unknown, but many scientists who are studying bioluminescence now believe that the origin of the phenomenon may be traced to a time when there was no oxygen in the Earth’s atmosphere. When oxygen was gradually introduced to the atmosphere, it was actually poisonous to life forms, plants and animals produced light to use up the oxygen in a gradual but necessary adaptation. It is speculated that millions of years ago, all life may have produced light to survive. As the millennia passed, life forms on Earth became tolerant of, and finally dependent on oxygen, and the adaptation that produced bioluminescence was no longer necessary, but some primitive plants and animals continued to use the light for new functions such as mating or attracting prey.
Question 36: Which of the following is the main topic of the passage?
A. Cold light
B. Luciferase
C. Primitive plants and animals
D. Earth’s atmosphere
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
________ is a situation in which large numbers of people have little or no food, and many of them die.
A. Disaster
B. Famine
C. Poverty
D. Flood
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
_______ is a situation in which large numbers of people have little or no food, and many of them die.
A. Disaster
B. Famine
C. Poverty
D. Flood.
