Câu 1
Đáp án do AI giảiDirections:In this section of the test, you will read FOUR different passages, each followed by 10 questions about it. For questions 1-40, you are to choose the best answer A, B, C or D, to each question. Then, on your answer sheet, find the number of the question and fill in the space that corresponds to the letter of the answer you have chosen. Answer all questions following a passage on the basis of what is stated or implied in that passage.
You have 60 minutes to answer all the questions, including the time to transfer your answers to the answer sheet.
PASSAGE 1
Questions 1-10
Never before have so many people packed into cities – places such as Los Angeles, Istanbul, Tokyo, and Lima – that are regularly affected by earthquakes. Located near the edge of Earth’s huge, shifting plates, these cities face the risk of death and economic disaster from large quakes – and from the tsunamis, fires, and other destruction they often cause. We understand earthquakes better than we did a century ago. Now, scientists would like to predict them, but is this possible?
In Japan, government scientists say they have an answer to the question. [A] “We believe that earthquake prediction is possible.” says Koshun Yamaoka, a scientist at the Earthquake Research Institute at the University of Tokyo. Earthquakes follow a pattern; they have observable signs, Yamaoka believes. In fact, Japan has already predicted where its next great earthquake will be: Tokai, a region along the Pacific coast about 160 kilometers (100 miles) southwest of Tokyo. Here, two plate boundaries have generated huge earthquakes every 100 to 150 years. And it could be a massive quake. The section along Tokai hasn’t had a major quake since 1854. The theory is that strain is building up in this region, and that it’s time for this zone to reduce its stress. Unfortunately, this is more a forecast than a prediction. It’s one thing to say that an earthquake is likely to happen in a high-risk area. It’s another to predict exactly where and when the quake will occur.
The desire for a precise prediction of time and place has led to another theory: the idea of “pre-slip.” Naoyuki Kato, a scientist at the Earthquake Research Institute, says his laboratory experiments show that before a fault in the Earth’s crust finally breaks and causes an earthquake, it slips just a little. If we candetectthese early slips taking place deep in the Earth’s crust, we may be able to predict the next big quake.
Clues in the Desert
Scientists working in Parkfield, California, in the U.S. are also trying to see if predicting earthquakes is possible. They’ve chosen the town of Parkfield not only because the San Andreas Fault runs through it but because it’s known for having earthquakes quite regularly – approximately every 22 years. In the late 1980s, scientists in Parkfield decided to study the fault to see if there were any warning signs prior to a quake. [B] Todo this, they drilled deep into the fault and set up equipment to register activity. Then they waited for the quake. [C]
Year after year, nothing happened. When a quake did finally hit on September 28, 2004, it was years off schedule, but most disappointing was the lack of warning signs. Scientistsreviewedthe data but could find no evidence of anything unusual preceding the September 28th quake. It led many to believe that perhaps earthquakes really are random events. Instead of giving up, though, scientists in Parkfield dug deeper into the ground. By late summer 2005, they had reached the fault’s final depth of three kilometers (two miles), where they continued collecting data, hoping to find a clue.
[D]. In an article published in the July 2008 journalNature, the researchers in Parkfield claimed to have detected small changes in the fault shortly before an earthquake hit. What had they noticed? Just before a quake, the cracks in the fault had widened slightly. Scientists registered the first changes ten hours before an earthquake of 3.0 on the Richter scale hit: they identified identical signs two hours before a 1.0 quake – demonstrating that perhaps the “preslip” theory is correct. In other words, it may in fact be possible to predict an earthquake.
What is the passage mainly about?
Đáp án và lời giải
Đáp án: C