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Traditionally, teaching and learning in UK Higher education takes place through lectures. The most familiar type of lecture is the formal presentation, (71) the lecturer stands at the front of a ’theatre or classroom and gives a talk (72) a topic which has been (73) in advance. The presentation usually lasts about 45 minutes and students are (74) to take notes and ask questions at the (75) .In recent years, (76) , lectures have become much more interactive. (77) the usual monologue which ends with questions, lecturers at many British universities now (78) students to play a much more active role in their learning. (79) that people learn better if they actively (80) in the learning process, and if they interact both (81) the topic they are studying and with other students.During interactive or informal lectures, students are allowed to interrupt (82) questions or ask the lecturer to explain (83) that they do not understand. The lecturer may also decide to (84) short group discussion tasks and then ask for feedback from each group. These approaches help to (85) any problems or issues which (86) and to ensure that students understand the focus of the lecture.Lecture styles (87) from subject to subject, from department to department, and even from lectures to lecturer, but there is one feature that all lectures (88) in common: they are intended to be an introduction (89) a topic or to provide an overview of a subject. Students are then expected to study the topic in more (90) for themselves, usually by going to the library and getting some of the books and journals recommended by the lecturer. 82（）
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According to the best historical and archaeological evidence, it is estimated that it took about 800 thousand to 1 million years for the earth’s population to reach the 250 total which existed at the end of the first century ’after Christ. For some time after that, disease, famine, and war kept the population increase down to a fraction of 1 percent a year so that more than 15 centuries passed before the population reached 500 million. But in the next 250 years, up to 1850, the population of the world shot up to the 1 billion mark, and today it has reached 3 billion. It is predicted by United Nations investigators that in the next 35 years the population of the world will double.When experts are asked what the most effective measure which overpopulation poses, they reply that at least three measures can be considered:(1) increasing sources and supply of food for underdeveloped countries; (2) increasing the industrialization of underdeveloped countries; (3) regulating conception and births. The experts add, however, that none of the proposed measures Can be effective by itself, that all must be combined into an integrated program. They also agree that without some regulation of conceptions and births, any other measures are doomed to failure. The population of the world doubled between the year（）
Traditionally, teaching and learning in UK Higher education takes place through lectures. The most familiar type of lecture is the formal presentation, (71) the lecturer stands at the front of a ’theatre or classroom and gives a talk (72) a topic which has been (73) in advance. The presentation usually lasts about 45 minutes and students are (74) to take notes and ask questions at the (75) .In recent years, (76) , lectures have become much more interactive. (77) the usual monologue which ends with questions, lecturers at many British universities now (78) students to play a much more active role in their learning. (79) that people learn better if they actively (80) in the learning process, and if they interact both (81) the topic they are studying and with other students.During interactive or informal lectures, students are allowed to interrupt (82) questions or ask the lecturer to explain (83) that they do not understand. The lecturer may also decide to (84) short group discussion tasks and then ask for feedback from each group. These approaches help to (85) any problems or issues which (86) and to ensure that students understand the focus of the lecture.Lecture styles (87) from subject to subject, from department to department, and even from lectures to lecturer, but there is one feature that all lectures (88) in common: they are intended to be an introduction (89) a topic or to provide an overview of a subject. Students are then expected to study the topic in more (90) for themselves, usually by going to the library and getting some of the books and journals recommended by the lecturer. 76（）
When a conductor in Spain asked to see her train ticket, Janet Loops, an exercise instructor from Palo Alto, Calif., reached for her purse-and discovered her wallet was gone. She had no ticket, passport, credit cards, traveler’s checks, cash. It took nearly a week to get a new passport and traveler’s checks. Her trip was almost ruined.To guard against such disasters, especially, overseas, some experts suggest carrying your money and documents in a small, flat pouch around your neck and tucked under your clothing. A fanny pack can be used if carried in front, but be alert-it can be cut off. Other possible ways to foil(阻挠) pickpockets: Wrap rubber bands around a wallet to make it harder to lift from a pocket. Have zippers sewn into your blazer pockets.The key is to stay alert and "pack your common sense," says Alfred Boza, a Miami Beach police detective. Know, for instance, that thieves could be watching for you to leave’ your bags unattended briefly at airport security checkpoints.If you’re driving in unfamiliar places, keep as little as possible in your car’s passenger area, where "smash and grab" thieves can get it. That means hiding luggage in the trunk and leaving nothing of value inside the passenger area when the car is parked. Also never leave maps-the mark of a tourist-visible. "Know where you’re going before you get there," Boza says. "When shopping, leave your most expensive purchase for last." Ask at your hotel what parts of the city are dangerous, and avoid them. Before leaving his hotel room, Robin Myers, a computer researcher in Cupertino, Calif. , puts cameras and other articles too large for the hotel safe into luggage with combination locks.Wherever you are - in case of an emergency - have a phone credit card and know how to use it. The card will enable you to call an 800 number for help, sparing you the need for coins or collect calls. The purpose of the passage is（）
防火墙是一种常用的网络安全装置，它可以（）。
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