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[单选题]
Many countries began to economic ties with China after its reform and opening-up policies.(1分)
A
expand
B
expend
C
extend
D
intend
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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)3.1 Friction arises when____.(1分)A. an opposing force of motion exists B. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
6. A.Personally B.Privately C.Generally D.Publicly
23.Plants bring life and color into the home and require little in the way of maintenance. Follow these simple tips and your plants should thrive.Look for the best place in the house for each plant, and don't be afraid to try different locations until you find the best spot. If a room seems too dark to sustain a healthy plant, don't be fooled. Most indoor plants originate in tropical and subtropical regions, in particular equatorial forests, and they thrive in dim environments and filtered light. The ideal spot is in front of a large window facing east or west, filtered if necessary through a net scrim curtain. If you have a plant that thrives on lots of sun, place it on a windowsill facing north or north-east. Check soil moisture levels regularly and inspect the leaves to check they are not being burned. At the slightest sign of withering, move the plant towards the middle of the room. Water poured directly onto the soil may flood, or not reach the pot plant's roots. Instead, water plants bottom up by standing them in a dish and filling the dish with water. Delicate plants such as fuchsias thrive on this method. For this method to work, all pots should have holes in the bottom through which the water is absorbed. If you don't want your plant to die of heat or cold, avoid placing it in draughty areas or near ducted heat or air-conditioning outlets. Water your plants only when the potting mix feels dry to the touch — over watering is often the cause of indoor plant death. Check by pushing your finger into the soil; if it comes out without any trace of soil on it, start watering. Remember that plants may need more frequent watering in summer. Most indoor plants benefit from an occasional misting of water. Make sure the water is at room temperature and use an atomizer or spray bottle. Misting is particularly beneficial if you live in a centrally heated or air-conditioned house as the air can become very dry.23.1 If a room seems too dark to sustain a plant, people should____.A.look for another room for indoor plantsB.only keep plants that originate in tropical areasC.still try to find ideal spot for indoor plants in the roomD.give up the idea of keeping indoor plants
1. Strange thing happens to time when you travel. Because the earth is divided into twenty-four time zones one hour apart, you can have days with more or fewer than twenty-four hours, and weeks with more or fewer than seven days.If you make a five-day trip across the Atlantic Ocean, your ship enters a different time zone every day. As you enter each zone, the time changes the hour. Travelling west, you set your clock back; travelling east, you set it ahead. Each day of your trip has either twenty-five or twenty-three hours.If you travel by ship across the Pacific you cross the international date line. By agreement, this is the point where a new day begins. When you cross the line, you change your calendar the full day, backward or forward. Travelling east, today becomes yesterday; travelling west, it is tomorrow!(5分)1.1 The best title for this selection is____.(1分)A. Trip Across the AtlanticB. How Time Changes Around the World C. Crossing the International Date LineD. How Time Zones Were Set Up
Leifeng always helps people without expecting anything______ .(1分)
----I’m sure Li Na will win the game in the Australian Open. ------Absolutely! She _______ for it for years.(1分)
3.5The tone of the passage is____.(1分)
Could it be in the restaurant in ____ you had dinner with me yesterday ____ you lost your handbag?(1分)
By seven o’clock this evening, he _______six hours
A man offered to____ her of her heavy luggage.
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