Read the passage and mark the letter A, B, C or D to answer the questions from 31 -35.
Fiberscopes are one of the most important Outcomes of the science of fiber optics. Fibers made of glass and transparent acrylic plastic are capable of conveying light energy, and when thousands of these fibers are combined in what is called a fiberscope, they can transmit images. The most common fiberscopes contain about 750,000 fibers, each 0.001 centimeter, or 10 microns, in diameter. For certain uses, the diameter of the fiber may be as small as 5 microns.
Fiberscopes have a wide range of applications. In the medical field, physicians use fiberscopes to examine internal organs and as an aid in delicate surgeries. Miniature probes have also been developed to view muscle fiber, skin tissue, and blood cells. Fiberscopes have also found varied uses in industry, particularly to inspect or control operations in inaccessible areas. Bundles of fiberscopes fused together in a solid plate, called a faceplate, are being used in the manufacture of television picture tubes and other cathode-ray tube devices.
The most far-reaching applications of fiber-optic technology are in communications. Optical fibers carry voice messages for telephone service. The sound of the voice is electronically broken down into thousands of pulses per second, which causes a transmitting laser to send coordinated pulses of light through the optical fibers. At the receiving end, the light pulses are converted to electrical signals and the voice message is reconstructed. Light-wave communication systems can handle an immensely greater number of telephone calls and television programs than the current system, and they will form the basis of the "electronic superhighway" expected to crisscross the nation in the near future of the information age.
As used in the last sentence, the word "they" refers to_____
A. fiberscopes
B. light-wave communication systems
C. television programs
D. telephone calls
Đáp án B
(Light-wave communication systems can handle an immensely greater number of telephone calls ... and they will form ...)
Dịch nghĩa: Hệ thống sóng ánh sáng giao nhau có thể thức hiện một số lượng lớn các cuộc gọi…và chúng
Gói VIP thi online tại VietJack (chỉ 400k/1 năm học), luyện tập gần 1 triệu câu hỏi có đáp án chi tiết
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
This ticket ____ you to a free meal in our new restaurant.
Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions
I only applied for this business with a view to accumulating first-hand experience.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
Peter’s wife gave him a(n)______bike as a birthday present last week.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
He received a pat on the _________ from his boss from the new project that he had done.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
________ the car about a kilometre from the stadium, I walked the rest of the way.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
Although the child was scolded by his parents at home, he did not display any __________ change at school.
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best completes each of the following exchanges
David is talking to Mary about her hairstyle.
David “Your hairstyle is terrific,
Mary?”. “________________”
Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions
To keep up with new developments and technology, modern people need to implement lifelong learning all the time.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
The room looks nice. It _________.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
________ my mother knew of my hatred for green beans, she still made me eat them when I was a child.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
I couldn’t have a nice conversation with him because his girlfriend kept on _____________ when we were talking to each other.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
He seems friendly__________ everyone in the village
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
Many students think that ______ they graduate from university, ____ chance they have to find a good job.
Read the passage and mark the letter A, B, C or D to answer the following questions from 36 - 42
Environmentalists often fear that tourists will trample all over sensitive natural resource areas, but tourism may bring the needed and only economic incentives to help drive conservation, said Bynum Boley. Ecotourism and natural resource conservation already have a mutually beneficial relationship that is ideal for creating a sustainable partnership.
"Ecotourism destinations benefit in the form of enhanced tourism competitiveness from the protection of quality natural resources," he said. "Meanwhile, the conservation of these natural resources is increasingly valued since these pristine natural resources are the foundation of the ecotourism industry and the driver of all economic benefits associated with ecotourism."
Tourism is a $7.6 trillion global industry, provides 277 million jobs and is a primary income source for 20 of the world's 48 least-developed countries. It also subsidizes environmental protection and helps protect, conserve and value cultural resources that might otherwise be undervalued by the host community, Boley said. In the newspaper, Boley and co-author Gary Green said that despite past tension between the tourism industry and environmentalists, the two should team up as allies to fight off increasing conversion of land away from its natural state, Ecotourists not only provide a boost to the economy in such places, they can also motivate landowners into keeping the environment in its natural state instead of converting it into something unsustainable. They could also influence the public perception of conservation, Boley explained, which does not often favor environmental protection.
“The public has become increasing less prone to respond to environmental messages,” he said. “Economic messages are needed in order to attract the public's interest.” Too often, Boley and Green said, unique natural resource areas are converted into urban, suburban and agricultural developments without considering their ecotourism potential. In addition to the lost ecotourism revenue, there are a host of negative environmental consequences such as biodiversity loss, water and food shortages and the land being unable to mitigate the effects of climate change. These areas are not valued for their unique attributes or the valuable natural resources they provide, Green said, “so we lose them.” Tourists have historically been seen as having a negative impact on the environment. Critics complain that they violate fragile and threatened natural environments while contributing to greenhouse gases from the increased number of flights to these exotic and often remote locales. While these criticisms are justified, Boley and Green said responsible programs promote education of ecological conservation and environmental sustainability, fostering a greater understanding and appreciation of these exotic areas.
(Adapted from https://wvvw.sciencedaily.com/ )
It can be inferred from the phrase “Economic messages are needed in order to attract the public's interest.” is ______.
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions
It is high time you made up your mind.