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Man has developed mechanical contraptions to help him travel quickly, but Nature has equipped some of her creatures with built-in speed. 1 _______. A jack rabbit can build up a speed of about forty-five miles an hour when a hound is close behind it. 2 _______. The white-tailed deer can do almost fifty miles an hour when it needs to and a long-legged ostrich can tiptoe over the ground at nearly a mile a minute. 3 _______. Many of the large fishes in the ocean can keep up with the fastest ocean liners man has made. There is one fish, the wahoo that can scoot along at seventy miles an hour. The really speedy animals, though, are animals of the air. 4 _______. A fast bird may even reach a speed of some aeroplanes.

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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!

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1 _______. Their colour and smell attract insects such as flies and wasps. The insects climb into the neck of the pitcher, slip down the sides and down in the water at the bottom. 2 ________. Pitcher plants have small lids to keep rain out. Pitcher plants don’t always manage to catch insects. 3 _______. It makes its web in the neck of the plant. Flies and other insects, which climb into the plant don’t fall right to the bottom. 4 _______.

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1 _______. A coral attaches itself to a rock or sand. At the top of the polyp tube there is a mouth. The mouth has special tubes, something like feelers, which suck in water plankton and small fish. 2 _______. But how does a coral get calcium for its cup? The warm seawater is full of the calcium needed by a polyp for growing its cup. The softbodied polyp sits in this hard cup which it builds up around itself from calcium. And the hard reef is the cup, or “skeleton” itself. 3 _______. Only in the waters near the equator there is enough calcium, for the reef-builders.
Reef-building corals live in groups or colonies. 4 _______. When the tiny polyps die, their skeletons remain. Other corals attach themselves to hard shells and, later on, also die. A mass of dead coral rises about three feet high in 1,000 years.

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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.