Câu hỏi:
26/04/2022 591Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions.
Many different kinds of food are sold today have artificial flavoring added to them.
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Trả lời:
Đáp án B
Kiến thức về mệnh đề quan hệ
*Căn cứ vào cấu trúc câu, ta thấy B sai. Nhận thấy câu có cùng lúc hai động từ là “are” và “have” chia theo thì của câu, do đó động từ thứ nhất cần chia theo dạng rút gọn mệnh đề quan hệ. Động từ “add” phía sau là một động từ thứ ba trong câu nhưng nó đã được rút gọn theo mệnh đề quan hệ về dạng Vp2 theo nghĩa bị động.
*Vì động từ “sell” mang nghĩa bị động ở đây nên theo quy tắc, ta bỏ đại từ quan hệ, bỏ “tobe” và giữ nguyên động từ ở dạng “Vp2”.
Tạm dịch: Rất nhiều loại thức ăn cái mà được bán ngày nay có hương vị nhân tạo được thêm vào chúng.
=>Đáp án B (are sold -> sold/ which (that) are sold)
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Câu 2:
Governments should take measures to protect wildlife, or more and more animals will become endangered.
Câu 3:
Some studies have suggested a link between certain types of __________ sweetener and cancer.
Câu 4:
Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions.
"Your application must be submitted before the end of the month," said the secretary to applicants.
Câu 5:
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.
Câu 6:
Câu 7:
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.
Astronomers have for the first time definitively ID’d the birth of a specific heavy element during a neutron-star smashup. They found strontium. And it showed up in the wavelengths of light — or spectra — making up this collision’s afterglow.
Scientists had assumed that a collision by two super-dense objects, such as neutron stars, would trigger a chain of nuclear reactions. They’re known as the r-process. In such an environment, the nuclei of atoms could rapidly gobble up neutrons. Afterward, those nuclei would become transformed in a process known as radioactive decay. The r-process was seen as a way to transform old, smaller elements into newer, bigger ones. About half of all elements heavier than iron were thought to be made in the r-process. Finding strontium in the recent collision at last offered the most direct evidence yet that neutron-star collisions really do trigger the r-process.
Physicists had long predicted that silver, gold and many other elements more massive than iron formed this way. But scientists weren’t sure where those r-process reactions took place. After all, no one had directly seen the r-process underway in a celestial event. Or they didn’t until the merger of two neutron stars in 2017. Scientists quickly analyzed light given off by that cataclysm. In it, they found evidence of the birth of a hodgepodge of heavy elements. All would seem to have come from the r-process.
The researchers were examining mostly very heavy elements — ones whose complex atomic structures can generate millions of spectral features. And all of those features were not yet fully known, Watson points out. This made it extremely difficult to tease apart which elements were present, he says.
Strontium, however, is relatively light compared to other r-process elements. And its simple atomic structure creates a few strong and well-known spectral clues. So Watson and his colleagues expanded their analysis to consider it. In doing so, they turned up the clear "fingerprint" of strontium. It emerged in light collected by the Very Large Telescope in Chile within a few days of the neutron-star collision. Seeing strontium in the afterglow wasn’t all that unexpected, says Brian Metzger. He’s an astrophysicist at Columbia University in New York City and not involved in the new work. Strontium, he notes, “does tell us something interesting” about the elements formed during the neutron-star collision.
(Source: https://www.sciencenewsforstudents.org/)
Which best serves as the title for the passage?
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