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It is not necessary to remove the lint from the filter every time the drier is used.
A．Y
B．N
C．NG
Setting off firecrackers is seen not merely as a (an) ______ lint also a big threat to man's life and property.
A．magnificence
B．interference
C．nuisance
D．appearance
"It won't hurt you to talk a little less. Go on a voyage. Try to reduce your weight. Avoid rich food."
Mr. Smith went to Switzerland. He did not know French or German and had to communicate through gestures. He attended a physical training course. The instructor made him bend his knees, swing his arms, stretch his neck and shake his head rapidly. He had to lie on the ground and raise his right and left legs alternatively. After a time his muscles grew hard and firm. He forgot the financial-crisis and the importance of raising the level of production. He even began to notice individual trees and individual birds.
Finally he returned home. But unfortunately his improvement was only temporary. Soon he was a normal businessman again, worried about his property, his profits, his savings, his advancement in a technological society, and things in general.
What advice did the doctor give Mr. Smith？
A．To eat less.
B．To have more exercises.
C．To change his surroundings.
D．To forget about his business.
By far the most important United States export product in the eighteenth and
nineteenth centuries was cotton, favored by the European textile industry over flax or
wool because it was easy to process and soft to tile touch. Mechanization of spinning
Line and weaving allowed significant centralization and expansion in the textile industry during
(5) this period, and at the same time the demand for cotton increased dramatically. American
producers were able to meet this demand largely because of tile invention of the cotton gin
by Eli Whitney in 1793. Cotton could be grown throughout the South, but separating the
fiber---or lint--from the seed was a laborious process. Sea island cotton was relatively
easy to process by hand, because its fibers were long and seeds were concentrated at the
(10)base of the flower, but it demanded a long growing season, available only along the
nation's eastern seacoast. Short-staple cotton required a much shorter growing season,
but the shortness of the fibers and their mixture with seeds meant that a worker could
hand-process only about one pound per day. Whitney's gin was a hand-powered machine
with revolving drums and metal teeth to pull cotton fibers away from seeds. Using the gin,
(15)a worker could produce up to 50 pounds of lint a day. The later development of larger
gins, powered by horses, water, or steam, multiplied productivity further.
The interaction of improved processing and high demand led to the rapid spread of
the cultivation of cotton and to a surge in production. It became the main American
export, dwarfing all others. In 1802, cotton composed 14 percent of total American
(20)exports by value. Cotton had a 36 percent share by 1810 and over a 50 percent share
in 1830. In 1860, 61 percent of the value of American exports was represented by cotton.
In contrast, wheat and wheat flour composed only 6 percent of the value of American
exports in that year. Clearly, cotton was king in the trade of the young republic. The
growing market for cotton and other American agricultural products led to an
(25)unprecedented expansion of agricultural settlement, mostly in the eastern half of the
United States---west of the Appalachian Mountains and east of the Mississippi River.
The main point of the passage is that the eighteenth and nineteenth centuries were a time when
A．the European textile industry increased its demand for American export products
B．mechanization of spinning and weaving dramatically changed the textile industry
C．cotton became a profitable crop but was still time-consuming to process
D．cotton became the most important American export product
"On the contrary," said Matilda, "I find it soothing and restful; but then, you see, I've lived in countries where things do happen, ever so ninny at a time, when you're not ready for them happening all at once." "That, of course, makes a difference," said Annabel.
"I have never forgotten," said Matilda, "the occasion when the Bishop of Bequar paid us an unexpected visit; he was on his way to lay the foundation stone of a mission-house or something of the sort." "I thought that out there you were always prepared for emergency guests turning up," said Annabel.
"I was quite prepared for half a dozen Bishops," said Matilda, "but it was rather disconcerting to find out after a little conversation that this particular One was a distant cousin of mine, belonging to a branch of the family that had quarreled bitterly and offensively with our branch about a Crown Derby dessert service; they got it, and we ought to have got it, in some legacy, or else we got it and they thought they ought to have it, I forget which; anyhow, I know they behaved disgracefully."
"It was rather trying, lint you could have left your husband to do most of the entertaining." "My husband was fifty miles up-country, talking sense, or what he imagined to be sense, to a village community that fancied one of their leading men was a were-tiger."
"A what tiger？" "A were-tiger; you've heard of were-wolves, haven't you, a mixture of wolf and human being and demon？ Well, in those parts they have were-tigers, or think they have, and I must say that in this case, so far as sworn and uncontested evidence went, they had every ground for thinking so. However, as we gave up witchcraft prosecutions about three hundred years ago, we don't like to have other people keeping on our discarded practices; it doesn't seem respectful to our mental and moral position,"
"I hope you weren't unkind to the Bishop," said Annabel. "Well, of course he was my guest, so I had to be outwardly polite to him, but he was tactless enough to rake up the incidents of the old quarrel, and to try to make out that there was something to be said for the way his side of the family had behaved; even if there was, which I don't for a moment admit, my house was not the place in which to say it. I didn't argue the matter, but I gave my cook a holiday to go and visit his aged parents some ninety miles away. The emergency cook was not a specialist in curries, in fact, I don't think cooking in any shape or form. could have been one of his strong points. I believe he originally came to us in the guise of a gardener, but as we never pretended to have anything that could be considered a garden he was utilised as assistant goatherd, in which capacity, I understand, he gave every satisfaction. When the Bishop heard that I had sent away the cook on a special and unnecessary holiday he saw the inwardness of the manoeuvre, and from that moment we were scarcely on speaking terms. If you have ever had a Bishop with whom you were not on speaking terms staying in your house, you will appreciate the situation."
Annabel confessed that her life-story had never included such a disturbing experience.
All of the following adjectives describe Annabel's impression of the landscape EXCEPT ______.
A．languid.
B．repressive.
C．enchanting.
D．boring.
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.
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