Sometimes, when people first see an automobile factory, they think it has no form. It is so big that it is impossible to see the design of the whole plant. In fact, the factory has been very carefully designed, so that it can be as efficient as possible.
There is not just one assembly line in the factory; there are several. On the main one, the chassis (车架) of the car is put together. The chassis is the frame on which the rest of the car is built. In another part of the factory, the body of the car is stamped out on sheets of steel. The body is painted, and then the two assembly lines come together. The body is lowered onto the chassis and fitted to it.
Meanwhile, in still another part of the factory, the engine is being put together on another assembly line. The central part of the engine is called the block, and the various other parts of the engine are fitted to it by different workers as it passes down the line. An internal combustion engine is a complicated piece of machinery, and this work must be done with great care. A piece which does not fit properly, or which is badly made, may spoil the engine.
When the engine is completed, the assembly line on which it has been put together joins the main one, where the chassis and the body have been fitted together. The engine is then placed in the car. After final adjustments have been made, the car can be rolled off the end of the assembly line to a parking lot, where it awaits shipment to the dealer who will sell it to the customer.
The automobile, a complicated machine with hundreds of different parts, is made quickly and efficiently by using the assembly line technique to its fullest extent.
68.The passage is mainly about .
how a car is designed
how a car is made
the assembly line technique in a car factory
how complicated a car is
69.Which of the following is NOT true?
The body is fixed to the chassis.
There are usually three assembly lines in a car factory.
The car factory is too big to be designed.
The assembly lines enable the workers to make cars quickly.
70.The main assembly line is responsible for .
the final adjustments
the central part of the engine
the chassis
the body
71.After it is made, the car .
will be kept in the parking lot for shipment
will be shipped to the dealer
will be adjusted in the garage
will be sold to the customer
