According to the passage, a radio telescope enables the detection of ______

Read the passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

   A radio telescope is a radio receiver that "sees" radio waves. Unlike a normal telescope, which sees light, a radio telescope is used primarily in the area of astronomy because it can detect radio waves that are emitted by celestial objects. Such objects in space, also called radio objects, can be things such as hot gas, electrons, and wavelengths given off by different atoms and molecules. 
   The first radio telescope was invented by Grote Reber in 1937. He was an American who graduated with a degree in engineering. He went on to work as an amateur radio operator and later decided to try to build his own radio telescope in his backyard. Reber's first two radio receivers failed to pick up any signals from outer space, but in 1938, his third radio telescope successfully picked up radio waves from space. 
   A radio telescope consists of a large parabolic-shaped dish antenna or a combination of two or more. The significance of the parabolic shape allows for the incoming radio waves to be concentrated on one focal point, allowing the signals to be picked up as strongly as possible. A larger dish means that more signals can be received and focalized. 
   In the late 1950s and early 1960s, the largest radio telescope of the time was invented with a seventy-six-meter telescope although larger telescopes have been made since then. The largest current radio telescope in the world is the RATAN-600 in Russia, whose diameter is  576 meters. It has provided valuable feedback of the sun's radio wavelengths and atmosphere. The largest radio telescope in Europe is a 100-meter diameter telescope in Germany, and the largest radio telescope in the United States is the Big Ear in the state of Ohio. The largest array of telescopes is the Giant Metrewave Radio Telescope in India. 
   Radio telescopes have provided scientists with valuable information about our universe. One of the most important functions of radio telescopes is their ability to allow scientists to track different space probes, the unmanned space missions in outer space. Radio telescopes allow for the travel of space probes into places like the surface of Mars that are too dangerous for men to explore. Without radio wave technology, scientists would not know much of what inhabits the universe nor would they be able to see it. Radio waves are our eyes and ears in outer space.

By Timothy Hall, Arthur H. Milch and Denise McCormach. How to Master skills for the TOEFL iBT 

According to the passage, a radio telescope enables the detection of ______.

• A. shapes and sizes of celestial objects 
• B. normal light of celestial objects
• C. creatures that inhabit celestial objects
• D. radio waves sent out by celestial objects

• Câu 2: Mã câu hỏi: 2594

  According to paragraph 2, all of the following are true about Grote Reber EXCEPT that ______.

  • A. he was an inventor
  • B. he was an engineer
  • C. he was an astronomer
  • D. he was an amateur radio operator

• Câu 3: Mã câu hỏi: 2596

  Grote Reber’s idea to develop a radio telescope was not successful until ______. 

  • A. he first built one in his backyard
  • B. he experimented on the third one
  • C. he picked up signals from outer space 
  • D. he graduated from an engineering school

• Câu 4: Mã câu hỏi: 2598

   The verb “pick up”  in paragraph 3 is closest in meaning to ______. 

  • A. select
  • B. send
  • C. recieve
  • D. lift

• Câu 5: Mã câu hỏi: 2602

  According to the passage, which of the following statements is TRUE?

  • A. The Big Ear in the United States produces the largest array of telescopes.
  • B. A larger dish antenna helps a radio telescope produce better results. 
  • C. The largest radio telescope of all time is the one with a seventy-six-meter diameter.
  • D. The pattern of radio waves received by radio telescopes is significant. 

• Câu 6: Mã câu hỏi: 2603

  The word “current”  in paragraph 4 is closest in meaning to ______. 

  • A. moving
  • B. water movement
  • C. electricity flow
  • D. existing

• Câu 7: Mã câu hỏi: 2604

  Radio waves are scientists’ eyes and ears in outer space because ______.

• Câu 8: Mã câu hỏi: 2605

  The word “they” in paragraph 5 refers to ______.

• Câu 9: Mã câu hỏi: 2606

  Originally, this passage was probably published in ______.

  • A. a business journal 
  • B. a scientific journal
  • C. a fashion magazine
  • D. a book on environment

• Câu 10: Mã câu hỏi: 2607

  The focus of discussion in the passage is ______.

  • A. radio telescopes
  • B. atoms and molecules
  • C. radio waves
  • D. radio operators