Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42
Scientists have discovered that for the last 160,000 years, at least, there has been a consistent relationship between the amount of carbon dioxide in the air and the average temperature of the planet. The importance of carbon dioxide in regulating the Earth's temperature was confirmed by scientists working in eastern Antarctica. Drilling down into a glacier, they extracted a mile-long cylinder of ice from the hole. The glacier had formed as layer upon layer of snow accumulated year after year. Thus, drilling into the ice was tantamount to drilling back through time.
The deepest sections of the core are composed of water that fell as snow 160,000 years ago. Scientists in Grenoble, France, fractured portions of the core and measured the composition of ancient air released from bubbles in the ice. Instruments were used to measure the ratio of certain isotopes in the frozen water to get an idea of the prevailing atmospheric temperature at the time when that particular bit of water became locked in the glacier.
The result is a remarkable unbroken record of temperature and of atmospheric levels of carbon dioxide. Almost every time the chill of an ice age descended on the planet, carbon dioxide levels dropped. When the global temperature dropped 9°F (5°C), carbon dioxide levels dropped to 190 parts per million or so. Generally, as each ice age ended and the Earth basked in a warm interglacial period, carbon dioxide levels were around 280 parts per million. Through the 160,000 years of that ice record, the level of carbon dioxide in the atmosphere fluctuated between 190 and 280 parts per million, but never rose much higher until the Industrial Revolution beginning in the eighteenth century and continuing today.
There is indirect evidence that the link between carbon dioxide levels and global temperature change goes back much further than the glacial record. Carbon dioxide levels may have been much greater than the current concentration during the Carboniferous period, 360 to 285 million years ago. The period was named for a profusion of plant life whose buried remains produced a large fraction of the coal deposits that are being brought to the surface and burned today.
Which of the following does the passage mainly discuss?
Giải bởi Vietjack
Đoạn văn chủ yếu thảo luận về cái gì?
Nguyên nhân hóa học của kỷ băng hà
Kĩ thuật sử dụng cho việc nghiên cứu lớp đá cổ trong sông băng
Bằng chứng cho mối quan hệ giữa mức độ carbon dioxide và nhiệt độ toàn cầu
Ảnh hưởng của đời sống thực vật lên mức độ carbon dioxide trong không khí
Đáp án C. Giải thích: Câu chủ đề nằm đầu đoạn văn bản:
Scientists have discovered that for the last 160,000 years, at least, there has been a consistent relationship between the amount of carbon dioxide in the air and the average temperature of the planet. (Các nhà khoa học đã phát hiện ra rằng trong 160.000 năm qua, ít nhất, đã có một mối quan hệ nhất quán giữa lượng carbon dioxide trong không khí và nhiệt độ trung bình của hành tinh.)
Stop acting like a child. In a few weeks, you'll be coming of _______ and nobody will tolerate your foolish behavior any longer.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
I was upset to learn that my first opponent would be Sam Muller, who _______ part in tournaments for no less than ten years.
Professor Wallace has been given a prestigious award in _____ of his pioneering research in treating the AIDS patients.
The expansion of the natural history museum is most _______ the cause of significant revenue increases.
On Sundays, many people take their cars to service stations _______
Of course, we don’t need this dictionary at present, but in the long ____ it may prove useful.
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined bold word(s) in each of the following questions.
Have you ever tried using hydrogen peroxide as a person to induce vomiting instead of the good old traditional methods?
Had they arrived at the sale early, they ______ a better selection.
It is important for a teacher to be totally impartial when determining which students will pass or fail.
It does not seem very probable that Eric will be able to find a new apartment before he has to leave his old one.
There are no problems with Dave. He seems ____ after in a proper way.
According to the passage, the drilling of the glacier in eastern Antarctica was important because it ________
Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.
