Danh sách câu hỏi ( Có 86,798 câu hỏi trên 1,736 trang )

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 30 to 34       As computer use becomes more common, the need for security is more common than ever. One of the greatest security threats in the online world is computer hacking.        Computer hacking is the unauthorized access to a computer or network of computers. Hackers are people who illegally enter systems. They may alter or delete information, steal private information, or spread viruses that can damage or destroy files. But how exactly can a hacker get into a system to do these things?        Most hackers use information called protocols that are built into computer software. These protocols allow computer to interact with one another. Protocols are sort of like computer police officers. When a computer connects to another system, the protocols check to see if the access is valid. The protocols can also determine how much information can be shared between the two systems. Hackers can manipulate the protocols to get unlimited access to a computer system.       In fact, just the act of entering a computer network is considered hacking. This is commonly called passive hacking. Passive hackers get a rush from just being able to access a challenging system like a bank or military network. Another kind of hacker tries to do damage to a system. After hacking into systems, these hackers release viruses or alter, delete, or take information. Known as active hackers, they are, by far, the more dangerous of the two.        The easiest way to protect a system is with a good password. Long and unusual passwords are harder for hackers to guess. For even greater security, some online services now use “password-plus” systems. In this case, users first put in a password and then put in a second code that changes after the user accesses the site. Users either have special cards or devices that show them the new code to use the next time. Even if a hacker steals the password, they won’t have the code. Or if the hacker somehow gets the code, they still don’t know the password.  What is the main idea of this reading?

Xem chi tiết 465 lượt xem 3 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.  Part of what makes summers so hot is also what causes thunderstorms. As heat from the sun beats down on Earth, the heat evaporates some of the water in lakes and oceans. The evaporated water stays in the air. This evaporated water makes the air feel heavy and humid. Humid air is what makes you feel hot and sticky (1) _______ the summer.  Warm humid air usually does not stay in one place. The wind can move it higher in the sky (2) _______ it will cool off. When warm humid air cools, it forms clouds. As more water is moved from lakes and oceans to the airs, the clouds get bigger and bigger.  Since summer, the air near the ground is hotter than it is during other seasons of the year. When this hot air mixes with cool air from (3) _______ area, there will be changes in the weather. Greater differences between the (4) _______ of the hot and cold air will cause greater changes in the weather. Imagine putting an ice (5) _______ in a warm drink. As soon as the ice hits the warm drink, it will crack and pop. But if you put the ice cube in a cool drink, it will not crack or pop as much. When warmer and cooler clouds get close to one another, there may be some popping and cracking as the weather changes. There may be more clouds or storms. A thunderstorm may be on its way.

Xem chi tiết 1.6 K lượt xem 3 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks from 25 to 29       Prime Minister Nguyen Xuan Phuc has delivered Vietnam’s strong message, aspiration, and determination to become a “country of renovation and creativity” and an economy with globally extensive (25) _______ when engaging in every activity of the World Economic Forum (WEF) 2019 in Davos, Switzerland.       He participated in 37 activities where he and heads of State and Government leaders of 50 countries and executives from (26) _______ groups around the globe discussed and dialogued matters relating to the forum’s theme “Globalization 4.0: Shaping a Global Architecture in the Age of the Fourth Industrial Revolution”.       Prime Minister Phuc said the Fourth Industrial Revolution is “knocking” on every enterprise and bringing profound changes that no country can be an outsider, and (27) ______ Vietnam’s wish to become one of the passengers at the (28) ________ of the Industry 4.0 train, and enthusiastically work with other countries to build a wealthy world.        In Davos, PM Phuc and WEF President Borge Brende had a dialogue themed “Vietnam and the World”, which is the first-ever event on Vietnam held by the WEF. Through the dialogue, PM Phuc conveyed strong messages about Vietnam’s development and international integration, asserting that (29) _______ the current circumstance, Vietnam has maintained an economic growth and socio-political stability that demonstrates itself a reliable destination for foreign investors coming to do business.

Xem chi tiết 716 lượt xem 3 năm trước

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question. Educating children at home as an alternative to formal education is an option chosen by families in many parts of the world. The homeschooling movement is popular in the United States, where close to one million Children are educated at home. In Canada, 1 percent of school-age children are homeschooled, and the idea also enjoys growing popularity in Australia, where 20,000 families homeschool their children. The movement is not limited to these countries. Homeschooling families can be found all over the world, from Japan to Taiwan to Argentina to South Africa. Homeschooling is not a novel idea. In fact, the idea of sending children to spend most of their day away from home at a formal school is a relatively new custom. In the United States, for example, it was not until the latter part of the nineteenth century that state governments began making school attendance compulsory. Before that, the concept of a formal education was not so widespread. Children learned the skills they would need for adult life at home from tutors or their parents, through formal instruction or by working side by side with the adults of the family. In the modern developed world, where the vast majority of children attend school, families choose homeschooling for a variety of reasons. For people who live in remote areas, such as the Australian outback or the Alaskan Wilderness, homeschooling may be their only option. Children who have exceptional talents in the arts or other areas may be homeschooled so that they have more time to devote to their special interests. Much of the homeschooling movement is made up of families who, for various reasons, are dissatisfied with the schools available to them. They may have a differing educational philosophy, they may be concerned about the safety of the school environment, or they may feel that the local schools cannot adequately address their children's educational needs. Although most families continue to choose a traditional classroom education for their children, homeschooling as an alternative educational option is becoming more popular. Which of the following could be the main idea of the passage?

Xem chi tiết 1.8 K lượt xem 3 năm trước