题目内容
| 任务型阅读 Florida, in the southeastern United States, is called the Sunshine State.It grows more oranges than any place except Brazil.But Arctic air has damaged some Florida oranges and strawberries in recent days, and killed fish at tropical fish farms. The unusually long period of cold weather has shown how even warm climates can sometimes freeze over.But protecting plants and trees in the garden may not be too difficult if you follow a few suggestions. Sudden cold can be the biggest threat, expecially after a warm period.Plants have not had a chance to harden their defenses.Those that are actively growing or flowering are at high risk. Try to choose plants that live best with cold weather, and make planting areas face west and south. Being near other growth may also provide warmth. Most frost damage takes place at night.Ice crystals form on the leaf surface.They pull moisture(水分) from the leaves and keep plant tissues from getting water. Cold weather is most likely to damage or kill plants that do not have enough moisture.So keep the garden watered.Moist soil absorbs more heat than loose, dry soil covered with mulch or vegetation. Experts of University of Arizona say covering plants and small trees with cloth or paper can help prevent frost damage.A onehundred watt light bulb designed for outdoor use can also provide warmth. Some people place Christmas lights on young trees for warmth.The bulbs should hang below the leaves to let the heat rise into the tree. Cold is especially dangerous to citrus trees.Agricultural specialists at the University of California suggest putting paper or cloth around the trunk and central branches of young Citrus trees. In Florida, as temperatures fell to record lows, citrus growers sprayed water on their trees to help prevent freeze damage. Jim Bottcher is a master gardener with the University of Florida extension.He explains that as the water freezes, it produces heat, and the ice forms a protective blanket around the tree.If you spray a tree, keep the water away from nearby power lines.Heavy ice can form and break them. You can also wrap a tree in palm tree frond leaves, corn stalks or fiberglass.Adding plastic film works well in rain and snow.But experts say plastic alone does not help much.
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世纪百通期末金卷系列答案|
You admire a person from a distance. Popular and known, you find it frightening just to be near that
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| You have waited 45 minutes for the valuable 10 minutes' break between classes.But when the bell for the next class rings, you can't __1__ how quickly time has passed. If you are familiar with this __2__, you'll know how time flies when you are having fun and__3__ when you are bored.Now scientists have __4__ a reason why this is the case. Scans have shown that patterns of activity in the brain __5__ according to how we focus on a task. When we are __6__, we concentrate more on how time is passing.And this makes our brains __7__ the clock is ticking more slowly. In an experiment __8__ by a French laboratory,12 volunteers watched an image __9__ researchers monitored their brain activity. The volunteers were told to __10__ concentrate on how long an image appeared for, then __11__ the color of the image, and thirdly, study both duration and color.The results showed that__12__ was more active when the volunteers paid attention to__13__ subjects. It is thought that if the brain is __14__ focusing on many aspects of a task, it has to__15__its resources, and pays less attention to the clock.__16__, time passes without us really __17__ it, and seems to go quickly.If the brain is not so active, it concentrates its __18__ energies on monitoring the passing of time.__19__, time seems to drag. Next time you feel bored __20__, perhaps you should pay more attention to what the teacher is saying! | ||||
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| Throughout history man has had to accept the fact that all living things must die. But people now live longer than they__1__.Yet, all living things still show the__2_of aging, which will eventually__3__death. Aging is not a disease, but as a person passes maturity (成熟期), the cells of the body and the__4__ they form do not function as well as they__5__in childhood and teenage years. The body provides less __6__against disease and is more__7__to have an accident. A number of related causes may__8__to aging. Some cells of the body have a fairly long life, but they are not__9__when they die. As a person ages, 10 of brain cells and muscle cells decreases. 11 body cells die and are replaced by new cells. In an aging person the 12 cells may not be as workable or as capable 13 growth as those of a young person. Another 14 in aging may be changes within the cells 15 . Some of the protein chemicals in cells are known 16 with age and become less elastic (有弹性). This is why the skin of old people wrinkles and 17 . This is also the reason why old people 18 in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as DNA and RNA, store and 19 information that the cells need. Aging may affect this 20 and change the informationcarrying molecules so that they do not transmit the information as well. | ||||
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your
and don't push past people to get off the airplane. On your flight ,
demands good sleep.Studies have shown that most people need eight hours of sleep each 
s move back and forth quickly.
More than 100,000 car accidents are caused each year by drivers who nod off (打盹). Almost $100 billion is lost yearly in the business and environmental
field.People deprived_of sleep have been factors in
accident.So do yourself and everyone around you a favour.Don't cheat yourself out of good sleep!