[填空题]When was the first bicycle invented
The first bicycle was invented（）.

[填空题]

When was the first bicycle invented The first bicycle was invented{{U}} {{/U}}.

[单项选择]What does the computer system do first when a problem arises（）
A. It sends out signals for help.
B. It takes over the driving immediately.
C. It stops the car automatically.
D. It sounds an alarm to warn the driver

[单项选择]What does the woman do first when she gets to school
[A] She usually does nothing.
[B] She usually does her homework first.
[C] She usually cleans her desk first.

[填空题]What should we do first when we decide to buy a car at "Autoweb. com" You should ___________________.

[单项选择]A radical new bicycle had its first public showing at the National British Cycling Championships in Shrewsbury last weekend. Based on the gold medal- winning design from the Barcelona Olympics, it is the first commercial mountain bike made of a single piece of carbon fibre.
Bicycles for amateurs have up to now been made of steel, aluminum or magnesium tubes welded together into the conventional "A-frame" shape. But last year, the British competitor Chris Boardman set world records while winning titles in the Olympic cycling pursuit events on a custom-built, carbon-fibre bicycle with lower weight and wind resistance than standard models. Because carbon fibre is born light and extremely strong, it does not need the A-frame shape, saving further weight Carbon fibre can also be moulded in a single piece, avoiding the weakness of welds.
The new bike, which will cost between $ 2000 and $ 3000 when it reaches the shops next month, has the same advantages as the Olympic model, it wei
A. it was made from the gold medal-winning design of the Barcelona Olympics
B. it was the first commercial mountain bike
C. its public showing last weekend aroused many people’s curiosity
D. it was made of one single piece of carbon fibre

[单项选择]When was Apple Computer foundedWhat was invented by Nolan Bushnell in 1972
A. a new machine
B. a new software
C. the first video game

[填空题]People who are buying their first bicycle are advised to spend as much money on a bicycle as they can

[单项选择]The first automobile was invented more than two hundred years ago. It used steam for power and had wooden wheels. The first automobile may have been simple and primitive, but it was an extremely important invention. The automobile today is the primary means of land transportation. It has produced more changes in our daily life than any other machines.
Almost all gasoline engines work in the same way—with four movements, or strokes, of a piston in a cylinder. The first stroke pulls the fuel mixture (gasoline and air) into the cylinder. The second stroke compresses the fuel mixture. A spark plug produces a spark that ignites the fuel mixture and causes the third stroke. The final stroke removes any waste gases which might remain in the cylinder.
The preceding paragraph explains what happens inside the cylinder to make the piston move. When the piston is pushed down by the explosion in the third stroke, it pushes the connecting rod. This rod rotates the crankshaft. The crankshaf
A. compress
B. remove waste
C. burn
D. to enter the cylinder