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There are over teachers in our college, ______ 60% are women teachers.(1分)
A
(A) of whom
B
(B) of them
C
(C) where
D
(D) which
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A
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3.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1Friction arises when____.(1分)A. an opposing force of motion existsB. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
The dress is really fashionable and eye-catching, but it is too big for me.(1分)
8. A. wasting time B. killing time C. taking time D. fooling around
. A. Responsive B. Respective C. Indifferent D. subjective
Since there isn't much time left, you can just tell us bout it _____.
We____ these raw materials directly from the producers.
The engineers are so busy that they have zero time for outdoor sports activities, _____ they have the interest.(1分)
22.4 How many types of classes are talked about in the passage?(2分)
When you are decorating a house ,it a diferrence whether you have a good interior designer or not .(1分)
Great changes____ in my hometown since I left for college in 1983.(1分)
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3.
The reason why an English speaker a Chinese speaker are not mutually intelligible is that language is not culturally transmitted.( )
4.
Passage Two We a1l love a hero, and rescue dogs are some of the biggest heroes of al1. You will often find them going above and beyond duty to save someone, risking -and at times losing -- their lives in the process.Rescue dogs are generally found in the Sporting and Hunting Groups,or from the traditional Herding Group. These types include the Bloodhound, Labrador Retriever,Newf oundland, German Shepherd, Golden Retriever, and Belgian Malinois : -all of which are chosen for search- and rescue duty because of their amazing physical strength, loyalty, and their tendency for mental stability.These types also have a keen sense of hearing and smell--to better locate lostindividuals- and are often able to access hard-to- reach areas. As highly trained animals, they serve in many different fields, including specialist search, snow slide rescue, dead body location, and tr acking.To overcome obstacles and succeed when perf om1ing the demanding duties of a search- and- rescue worker, a dog must display certain qualities. In addition to intelligence and strength, the dog must be swift, confident, easily trainable, adaptable, and have a high level of stamina (耐力) and endur ance.A strong sense of group cooperation and an ability to engage in friendly p1ay during dowmn" time is also required of search - and rescue dogs.A rescue dog goes through many, many hours of intensive training to be fit forduty. Training is not for the faint -hearted. Cer tification training can take from two to three years, working three to four hours a day, three to six days a week, 0ften in group, team- oriented sessions.Each search- and- rescue field requires different types of training. Rescue training,for instance, includes air scenting ”- where dogs are trained to smell the air for the victim’ s scent (5 气味) and then fol1ow the scent to the person. This alility is crucial to finding victims tr apped under collapsed buildings and snow slide.
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毛泽东思想被确立为中国共产党的指导思想是在( )
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