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1.3 Which could be the best title for this passage?____(1分)
A
American Culture.
B
Time and Culture.
C
Benefits of Future Orientation.
D
The Regulation of Time.
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B
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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
Europe is filled with stunning cathedral treasures that have stood for centuries. Many who have visited studied the continent’s Christian architecture say France’s Chartres Cathedral is in a class by itself.
1. ( )means the property of having two levels of structures, such that units of the primary level are composed of elements of the secondary level and each of the two levels has its own principles of organization.
22.Fifty volunteers were alphabetically divided into two equal groups, Group A to participate in a 7 week exercise program, Group B to avoid deliberate exercise of any sort during those 7 weeks. On the day before the exercise program began, all 50 men participated in a step-test. This consisted of stepping up down on a 16-inch bench at 30 steps a minute for 5 minutes. One minute after completion of the step-test, the pulse rate of each subject was taken had recorded. This served as the pretest for the experiment. For the next 7 weeks, subjects in the experimental group (Group A) rode an Exercycle (a motor-driven bicycle-type exercise machine) for 15 minutes each day. The exercise schedule called for riders to ride relaxed during the first day's ride, merely holding on to the handle bars foot pedals as the machine moved. Then, for the next 3 days, they rode relaxed for 50 seconds of each minute, pushed, pulled, pedaled actively for 10 seconds of each minute. The ratio of active riding was increased every few days, so that by the third week it was half of each minute, by the seventh week the riders were performing 15 solid minutes of active riding.
______the next day, we would have climbed the mountain with her.(1分)
4. A.similar B.same C.different D.various
According to the survey, in summer, the _______ the temperature is, the _______accidents there would be
Try to make as____ mistakes as possible in your homework.
I enjoy playing basketball and then____.
Only after sowing ________, as you should never expect good result without endeavor
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