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21.3 Friction arises when____.
A
A. an opposing force of motion exists
B
B. the energy is wasted
C
C. everything is motionless
D
D. a complicated machine is supplied with energy
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5. A.led B.lead C.leads D.leading
Passage ThreeWhat exactly is a lie? Is it anything we say which we know is untrue? Or is it something more than that? For example, suppose a friend wants to borrow some money from you, you say "I wish I could help you but I'm short of money myself." In fact, you are not short of money but your friend is in the habit of not paying his debts and you don't want to hurt his feeling by reminding him of this.Is this really a lie?Professor Jerald Jellison of the University of Southern California has made a scientific study of lying.According to him, women are better liars than men, particularly when telling a "white lie".For instance, when a woman at a party tells another woman that she likes her dress, she really thinks it looks awful.However, this is only one side of the story. Other researchers say that men are more likely to tell more serious lies, such as making a promise which they have no intention of fulfilling.This is the kind of lie politicians and businessmen are supposed to be particularly skilled at: the lie from which the liar hopes to profit or gain in some way.Research has also been done into the way people's behavior changes in a number of small,apparently unimportant ways when they lie. It has been found that if they are sitting down at the time, they tend to move about in their chairs more than usual.To the trained observer they are saying "I wish I were somewhere else now" .They also tend to touch certain parts of the face more often, in particular the nose.One explanation of this may be that lying causes a slight increase in blood pressure.The tip of the nose is very sensitive to such changes and the increased pressure makes it itch.Another gesture which gives liars away is what the writer Desmond Morris in his book Man-watching calls "the mouth cover". He says there are several typical forms of this, such as covering part of the mouth with the fingers, touching the upper-lip or putting the hand at one side of the mouth.Such a gesture can be understood as an unconscious attempt on the part of the liar to stop himself or herself from lying.Of course, such gestures as rubbing the nose or covering the mouth or moving about in a chair cannot be taken as proof that the speaker is lying. They simply tend to occur more frequently in this situation.It is not one gesture alone that gives the liar away but a whole number of things, and in particular the context in which the lie is told.31.According to the passage, a "white lie" seems to be a lie ( ).A.that other people believeB.that other people don't believeC.told in order to avoid offending someoneD.told in order to take advantage of someone
________ here now, we would have a wonderful time together
_______, he will invest in oil exploration.
写作专项练习（5）
21.2 Grandparents usually do many things except .(2分)
The thief ran away at the _______ of a policeman.
21.2 Care-giving strategies have some effect on infant's crying____.(2分)
10. (A)unpleasant (B)rough (C)difficult (D)hard
4. Using medicines derived from plants is a practice probably as old as humankind itself. Prehistoric peoples likely noted when consuming a particular plant part provided relief, such as willow bark "tea" lowering a fever. Sumatran (苏门答腊的) clay tablets engraved forty centuries ago list plant-based remedies for common ills, as do ancient writings from Egypt and China. In nineteenth-century United States, St. John's wort Echinacea were just two of many commonly used herbal remedies.Many modern medicines are synthetic versions of plant-derived "natural products." A compound from a periwinkle plant, for example, served as the basis for a powerful drug that fights leukemia (白血病). Poppies provide alkaloids such as morphine that are potent painkillers.In the U.S. today, one-third of all adults have tried herbal treatments, creating a multibillion-dollar market. The resurgence of interest in herbal medicine is largely due to the Dietary Supplements Health Education Act (DSHEA. of 1994, which expanded the definition of "dietary supplement" beyond essential nutrients to include "herbs botanicals," thus removing them from regulation as drugs. This designation means that labels can only mention ways that the herbal product can promote health, not cure disease. For example, valerian root "promotes restful sleep," St. John's wort "may help enhance mood," and Echinacea goldenseal "may help support the immune system." Many physicians biochemists argue that active ingredients in many herbal remedies are indeed drugs, should be regulated as such.It is wise to consult a physician when considering use of an herbal product. Even for a well-understood remedy such as cranberry extract, additional therapy may be required, or drug interactions a possibility. The law may not currently consider herbal ingredients to be drugs, but science indicates otherwise.
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