everybody in the house woke up when the burglar alarm

B. went off

Đáp án chủ yếu xác

Mark the letter A, B, C or D to lớn indicate the word/phrases SIMILAR in meaning to lớn the underlined word(s) in each of the following questions.

Question 22: The United Nations Educational, Scientific and Cultural Organization (UNESCO), was established in 1946.

A. mix up

B. found out

C. lập cập through

D. put away

Mark the letter A, B, C or D to lớn indicate the word/phrases SIMILAR in meaning to lớn the underlined word(s) in each of the following questions.

Question 23: Paris is the ideal place to lớn learn French; it’s a beautiful and hospitable thành phố with Institutions for high quality linguistic teaching.

A. friendly

B. natural

C. affectionate

D. noticeable

Mark the letter A, B, C or D to lớn indicate the word or phrase that is OPPOSITE in meaning to lớn the underlined part in each of the following questions.

Question 24: I would be happy to go along with the idea.

A. to disagree with the idea

Xem thêm: ai đã đặt tên cho dòng sông thuộc thể loại gì

B. to agree with the idea

C. to lớn tư vấn the idea

D. to approve with the ideas

Mark the letter A, B, C or D to lớn indicate the correct answer to lớn each of the following questions.

Question 8: Although thunder and lightning are produced at the same time, light waves travel faster _____, sánh we see the lightening before we hear the thunder.

A. than sound waves do

B. than sound waves are

C. tự sound waves

D. sound waves

Mark the letter A, B, C or D to lớn indicate the correct answer to lớn each of the following questions.

Question 12: 500 years ago, the average human ______ was about 40 years.

A. lifespan

B. lifetime

C. life cycle

D. life length

Read the following passage and mark the letter A, B, C or D to lớn indicate the correct answer to lớn each of the questions from 36 to lớn 42.

Light from a living plant or animal is called bioluminescence, or cold light, to lớn 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 lớn 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 lớn Raphael Dubois, who extracted a luminous fluid from a clam, observing that it continued to lớn 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 lớn 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 lớn 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 lớn a time when there was no oxygen in the Earth’s atmosphere. When oxygen was gradually introduced to lớn the atmosphere, it was actually poisonous to lớn life forms, plants and animals produced light to lớn 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 lớn 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 lớn use the light for new functions such as mating or attracting prey.

Question 39: The word “it” refers to:

A. a plant

B. an animal

C. bioluminescence

D. incandescence

Xem thêm: 2k5 còn bao nhiêu ngày thi thpt quốc gia