Вопрос № 605289 - Английский язык

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There are more than 20 different minerals in the body. 1_______. Then there are small quantities of sulphur, chlorine, magnesium, iron, copper, iodine, fluorine, cobalt, zink and others. Three of the most important minerals are calcium, phosphorus and iron. 2_______. The bones and teeth have 99 per cent of the calcium in the body. If people have enough calcium and phosphorus their bones and teeth will be strong and hard. 3_______. Milk and hard cheeses are the best sources of calcium. 4_______.

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Many unique fish species live in the waters of the Great Barrier Reef.
WORLD WONDERS
1. It has taken millions of years for the Colorado River to carve the Grand Canyon out of solid rock in Arizona in the United States. The youngest rocks at the top are 235 million years old and those at the bottom are about 2 billion years old. The canyon is 1.6 km at its deepest and 15 km wide, stretching over 450 km in length.
2. Work on the Colosseum in Rome started in AD 70 and it was completed 12 years later. It was built as an arena for gladiator contests, chariot races and other Roman sports. When it was ready, Emperor Titus had an opening ceremony that lasted 100 days. During the ceremony alone, 1,000 gladiators and 5,000 animals were killed!
3. In 221 BC Emperor Qin decided to build a wall to keep invaders out of China. The Great Wall took 10 years to build and used a workforce of 300,000 soldiers and 500,000 slaves. The main part of the wall is 3,460 km long, between 7 and 12 m high and between 6 and 15 m wide (enough to allow five men on horseback to ride side by side).
4. The Great Barrier Reef in northern Australia is a coral reef made of millions of tiny living sea creatures. It is 2,000 km long and it is the longest coral reef in the world. The water on the reef is shallow and warm and it is home to an impressive number of animals and fish. Many of them are not found anywhere else in the world.

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Road traffic is increasing worldwide. 1 _______. However, engineers are working on Advanced safety vehicles (ASVs) which will be much safer for drivers, other road users such as cyclists, and for pedestrians. 2 _______. ASVs will be equipped with electronic sensors to prevent accidents and to make it safer for people when accidents do happen. 3 _______. Others will warn drivers when they are too close to other vehicles.
4 _______. Electric motors are very efficient and produce no pollution, but they need heavy batteries and their range is limited with current technology. Hybrid cars have both a petrol engine and an electric motor. They save about 15% of fuel. They need batteries but they don’t have to be charged overnight as the motor acts as a generator when the car brakes. Liquefied petroleum gas (LPG) is already used as a fuel. Cars can be converted easily but LPG only cuts down pollution a little. Hydrogen fuel cells may be the long-term answer. They provide clean power but each cell is very expensive.

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The device is called a Dervish. It is a mine-detonating vehicle for clearing anti-personnel mines from farmland in developing world countries. 1 _______. The United Nations estimates that 24,000 people die each year because of mines.
2 _______. Each wheel has steel teeth to create more pressure. When the teeth pass over a mine, it explodes. 3 _______. A motorbike engine powers the Dervish.          4 _______. As each wheel passes a certain point in the rotation, it slows down. This makes the machine advance in tight circles, about 30 mm apart. For this reason no mine in its path is missed.

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1 _______. When the driver brakes, the resistance of the motor helps to slow down the car. At the same time, the energy from the wheels turns the motor which then functions as a generator, producing electricity to recharge the batteries. When the batteries are low, the petrol engine also drives the generator.
2 _______. The petrol engine shuts off when the car comes to a stop. When the driver presses the accelerator, the motor instantly starts the engine again. No energy is wasted from idling when the car is stopped.
3 _______. They do not require special fuel like hydrogen cars and, unlike electric cars, they do not need to be plugged in overnight to recharge the batteries.              4 _______.

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1 _______. This logs all passenger calls and monitors the number of passengers travelling from floor to floor, the position of any car in the system, and its speed. It can direct passengers to the car which will get them to their destination fastest and will prevent any car which is overloaded from moving.
Lifts have many safety devices which make it virtually impossible for an accident to happen. 2 _______. Each one is strong enough to support the car. If the car starts too quickly, a governor or safety brake locks the car to the guide rails. 3 _______. Doors on the car ensure that no passenger can be injured by contact with the shaft. The car cannot move until both sets of doors are closed. 4 _______. All these things combined make travel in lifts one of the safest journeys you can make!