In my opinion, it is important that the water (clean) ______before we use it.

are used to chew food

are all the same as the ape’s

can swallow a whole fish

are used to catch food

Did you know that the parachute was invented before the airplane This is (1) but true. The first airplane was flown in 1903. However, Leonardo da Vinci, the Italian artist-scientist, drew sketches of a (2) over 450 years ago. The first successful parachute jump was made from a tower (3) a French scientist, Sebastien Lenormand, in 1783. In 1785 J. P. Blanchard of France used a parachute to eject a dog from a hot-air balloon.

People (4) to use parachutes first for thrills and fun. Andre Jacques Garnerin, also of (5) , was the first to drop from a balloon at a (6) of 2000 feet using a parachute. Garnerin continued to parachute for a number of years, as (7) many others. It wasn’t until World War I, (8) , that the parachute became important for saving lives. By the end of the war, it had become standard safety equipment for nearly all (9) . In addition, parachutes were also worn by military passengers on (10) .

Today the parachute is used (11) several purposes. It is invaluable when firefighters must be dropped at the scene of a fire in (12) areas. These areas are often (13) isolated that they can’t be reached by other means. The parachute is also used to drop rescuers and supplies to victims of disasters. It is also used by the military to (14) soldiers and equipment.

Parachute jumping has also become a popular (15) . Many airports have schools that teach correct procedure. They also provide the airplanes to carry (16) aloft. Experienced jumpers often take up sky diving. In sky diving the jumpers don’t open their parachutes immediately. (17) they fall freely toward the earth doing various tricks, after which they then open their parachutes. They do this just in time for a safe (18) .

There are many (19) records in parachuting. The longest fall before opening a parachute for a safe landing was accomplished in 1962 by a Russian who fell over fifteen and one-half miles (20) using the parachute. The highest jump was made by an American in 1960. Air Force Captain Joseph Kittinger, Jr., jumped from a balloon nineteen and one-half miles high.

It looks like a great big cigar, (1) it is really a dangerous saltwater fish called barracuda. This (2) fish has a narrow body which grows to be from four to six feet long. However it may reach ten feet in (3) ! The barracuda looks very much (4) the pike, a freshwater fish.

Although the barracuda is not related (5) the pike, it is like that freshwater fish in being a fearless fighter. The barracuda has a large mouth and strong jaws that hold knifelike (6) . When attacking or defending (7) the barracuda moves like lightning. It usually feeds on other fish. But it has been known to (8) swimmers. No wonder it is called "the tiger of the sea" !

The barracuda is usually found in warm, tropical seas or (9) . The most dangerous kind, the great barracuda, is found off the (10) of Florida, Bermuda, and the West Indies. (11) caught for food live in the warm waters off the coast of California and Australia.

To (12) its enemies, the barracuda can camouflage itself. It does this by taking on the color of its (13) . Its back changes from light brownish green (14) deep blue, its sides sparkle with silvery tones, and its belly is chalky white. The barracuda’s tail and fins may be greenish yellow or gray.

Bright eyes flash as it roams the (15) . When it rests on the sandy ocean floor, it becomes ahnost (16) as long as it stays quite still. Even when it prowls around a coral reef, it is difficult to spot, even in (17) water. People who (18) for sport try to excite the barracuda to move by tying a long, white rag behind their moving boat. However, they are often (19) . But they never give up trying to trick "the (20) of the sea

正确

错误

are used to chew food

are all the same as the ape’s

can swallow a whole fish

are used to catch food

Did you know that the parachute was invented before the airplane This is (1) but true. The first airplane was flown in 1903. However, Leonardo da Vinci, the Italian artist-scientist, drew sketches of a (2) over 450 years ago. The first successful parachute jump was made from a tower (3) a French scientist, Sebastien Lenormand, in 1783. In 1785 J. P. Blanchard of France used a parachute to eject a dog from a hot-air balloon.

People (4) to use parachutes first for thrills and fun. Andre Jacques Garnerin, also of (5) , was the first to drop from a balloon at a (6) of 2000 feet using a parachute. Garnerin continued to parachute for a number of years, as (7) many others. It wasn’t until World War I, (8) , that the parachute became important for saving lives. By the end of the war, it had become standard safety equipment for nearly all (9) . In addition, parachutes were also worn by military passengers on (10) .

Today the parachute is used (11) several purposes. It is invaluable when firefighters must be dropped at the scene of a fire in (12) areas. These areas are often (13) isolated that they can’t be reached by other means. The parachute is also used to drop rescuers and supplies to victims of disasters. It is also used by the military to (14) soldiers and equipment.

Parachute jumping has also become a popular (15) . Many airports have schools that teach correct procedure. They also provide the airplanes to carry (16) aloft. Experienced jumpers often take up sky diving. In sky diving the jumpers don’t open their parachutes immediately. (17) they fall freely toward the earth doing various tricks, after which they then open their parachutes. They do this just in time for a safe (18) .

There are many (19) records in parachuting. The longest fall before opening a parachute for a safe landing was accomplished in 1962 by a Russian who fell over fifteen and one-half miles (20) using the parachute. The highest jump was made by an American in 1960. Air Force Captain Joseph Kittinger, Jr., jumped from a balloon nineteen and one-half miles high.

It looks like a great big cigar, (1) it is really a dangerous saltwater fish called barracuda. This (2) fish has a narrow body which grows to be from four to six feet long. However it may reach ten feet in (3) ! The barracuda looks very much (4) the pike, a freshwater fish.

Although the barracuda is not related (5) the pike, it is like that freshwater fish in being a fearless fighter. The barracuda has a large mouth and strong jaws that hold knifelike (6) . When attacking or defending (7) the barracuda moves like lightning. It usually feeds on other fish. But it has been known to (8) swimmers. No wonder it is called "the tiger of the sea" !

The barracuda is usually found in warm, tropical seas or (9) . The most dangerous kind, the great barracuda, is found off the (10) of Florida, Bermuda, and the West Indies. (11) caught for food live in the warm waters off the coast of California and Australia.

To (12) its enemies, the barracuda can camouflage itself. It does this by taking on the color of its (13) . Its back changes from light brownish green (14) deep blue, its sides sparkle with silvery tones, and its belly is chalky white. The barracuda’s tail and fins may be greenish yellow or gray.

Bright eyes flash as it roams the (15) . When it rests on the sandy ocean floor, it becomes ahnost (16) as long as it stays quite still. Even when it prowls around a coral reef, it is difficult to spot, even in (17) water. People who (18) for sport try to excite the barracuda to move by tying a long, white rag behind their moving boat. However, they are often (19) . But they never give up trying to trick "the (20) of the sea

正确

错误