The motor housing is ______ to the stand.

Which of the following is the guarantee of a better future for US economy？

［A］Motor vehicles.

［B］Housing market.

［C］Business equipment.

［D］Computer gear.

？ Look at the list below. It shows some international trade fairs.

？ For questions 6-10, decide which fair (A-H) each person on the opposite page should visit.

？ For each question, mark the correct letter (A-H) on your Answer Sheet.

？ Do not use any letter more than once.

TRADE FAIRS

A Meeting Place for the International Motor Industry

B International Sales Exhibition for Apple Computers

C Special Exhibition for the Bakers' and Confectioners' Trade

D Trade Fair for Electrical Engineering

E The International Travel Trade Fair

F Architects' Computer Systems Exhibition

G Consumer Exhibition for Living, Housing and Leisure

H Pads Book Fair

Felton Builders needs to update his software used in designing houses.

oom and dustpan. With or without their special attachments, these cleaners can handle hardwood floors, wails, carpets, furniture, and draperies, and are an important factor in the maintenance of appliances such as window air conditioners and refrigerators.

Although vacuum cleaners are available in a variety of sizes and shapes (the two major categories are tank or canister and upright), they all work on the same principle. As for electric brooms, they are in fact lightweight, upright vacuum cleaners with the same working parts.

At the heart of a vacuum cleaner is an electric motor housed in a compartment. The motor drives a shaft which causes a fan to whir. The fan pulls air through the housing and forces it out through the outlet end of the cleaner.

All this occurs at a very high rate of speed. Vacuum cleaner motors operate at a very high rate of speed. Vacuum cleaner motors operate at approximately 3000 to 10,000 + revolutions per minute, depending upon design. With this speed, a great quantity of air is moved at once, creating suction.

As the fan draws air through the compartment, it creates suction at the inlet end of the housing — the end with the pickup attachment. In canister-type vacuum cleaners, the pickup is a long hose equipped with the nozzle (or brush or wand, or other cleaning attachment). In upright Units, the pickup is a brush-equipped roller mechanism (sometimes with a beater bar) that sweeps along the floor or rug.

The high-speed fan sucks air through the pickup attachment and into the inner compartment. As it docs so, it creates a vacuum -- an empty space from which all air has been removed. The crucial point of a vacuum is that air around it always rushes in to fill the empty space. In other words, an area of high pressure always rushes toward an area of low pressure.

In a vacuum cleaner, the air that surges in to fill the vacuum carries with it dust, dirt, and lint particles. The air that flows in to fill the vacuum flows on into a container or bag. (One brand of electric broom uses a plastic cup; others, and vacuum cleaners, use a bag. ) Vacuum cleaner bags are made of a special paper or cloth that is porous enough to permit a free flow of air, fight enough to trap most of the dust and dirt, and tough enough to withstand the pressure without tearing. The cloth bags can be cleaned and re-used. Paper bags are discarded when full and replaced with new ones.

Beyond the bag is a filter that permits air to flow through but which captures finer dust and dirt that was not trapped by the bag. The air -- relatively clean by now -- passes next over the vacuum cleaner motor, cooling it, and then on out through the outlet.

How to Repair a Vacuum Cleaner

The chief complaint of those who use vacuum cleaners and electric brooms is lack of suction— it won't "pick up." Sometimes the complaint is based on a real problem; other times, the solution can be a simple one.

You can check to see if your cleaner is creating sufficient vacuum by scattering some sawdust over the floor. If some of the sawdust remains after you bare swept the vacuum cleaner over it, the suction is not sufficient. The unit needs servicing.

The most common cause of insufficient suction is a full dust bag or a dirt-clogged filter. Dirt— clogged nozzles, hoses and passages also reduce suction — in fact, anything that cuts down on the free movement of air cuts down the efficiency of a vacuum cleaner.

If you are having problems with suction, cheek first to see if the dust bag or filter are clogged. Remove both. Place the cleaner in a position where it will not pick up dirt, then switch it on. (Never operate a vacuum cleaner or electric broom in the cleaning position without a dust bag, pickup receptacle or filter.) Dust will be pulled into the motor, where it

A．The whirring of the fan does not necessarily occur at a high speed.

B．A vacuum is created as the fan sucks air into the inner compartment.

C．As a vacuum cleaner works, a magnetic field is created, drawing dust, dirt and other particles into the machine.

D．There is a filter in a vacuum cleaner, whose sole function is to permit air to flow through.

nd housing in the past few months are leading economists to revise their real gross domestic product (GDP) forecasts upward supporting the notion that the recession ended in December or January.

Bear in mind: This recovery won’t have the vitality normally associated with an upturn. Economists now expect real GDP growth of about 1.5 in the first quarter. That’s better than the 0.4 the consensus projected in December, but much of the additional growth will come from a slower pace of inventory drawdowns, not from surging demand.

Moreover, the economy won’t grow fast enough to help the labor markets much. The only good news there is that jobless claims have fallen back from their spike after September 11 and that their current level suggests the pace of layoffs is easing.

The recovery also does not mean the Federal Reserve will raise interest rates soon. The January price indexes show that inflation remains tame. Consequently, the Fed can take its time shifting monetary policy from extreme accommodation to relative neutrality.

Perhaps the best news from the latest economic reports was the January data on industrial production. Total output fell only 0.1, its best showing since July. Factory output was flat, also the best performance in six months. Those numbers may not sound encouraging, but manufacturers have been in recession since late 2000. The data suggest that the factory sector is finding a bottom from which to start its recovery.

Production of consumer goods, for instance, is almost back up to where it was a year ago. That’s because consumer demand for motor vehicles and other goods and the housing industry remained healthy during the recession, and they are still growing in early 2002.

Besides, both the monthly homebuilding starts number and the housing market index for the past two months are running above the averages for all of 2001, suggesting that home-building is off to a good start and probably won’t be big drag on GDP growth this year.

Equally important to the outlook is how the solid housing market will help demand for home-related goods and services. Traditionally, consumers buy the bulk of their furniture, electronics, and textiles within a year of purchasing their homes. Thus, spending on such items will do well this year, even as car sales slip now that incentives are less attractive. Look for the output of consumer goods to top year-ago level in coming months.

Even the business equipment sector seems to have bottomed out. Its output rose 0.4% in January, led by a 0.6% jump computer gear. A pickup in orders for capital goods in the fourth quarter suggests that production will keep increasing—although at a relaxed pace—in coming months.

第31题：American economists are surprised to see that______.

［A］they have to revise the GDP forecasts so often

［B］their government is announcing the end of a recession

［C］US economy is showing some signs of an upturn

［D］GDP growth reflects stronger domestic demand

Recently, people more concern about _________.

A．the housing shortage and the housing deprivation in Belgium

B．the deterioration of housing conditions

C．the government's macroeconomic and microeconomic policies

D．how to buy their own houses by the aid of the government

分子马达(molecular motor)