单选题Guthrie's contiguity principle offers practical suggestions for how to break habits. One application of the threshold method involves the time young children spend on academic activities. Young children have short attention spans, so the length of time they can sustain work on one activity is limited. Most activities are scheduled to last no longer than 30 to 40 minutes. However, at the start of the school year, attention spans quickly wane and behavior problems often result. To apply Guthrie's theory, a teacher might, at the start of the year, limit activities to 15 to 20 minutes. Over the next few weeks the teacher could gradually increase the time students spend working on a single activity. The threshold method also can be applied to teaching printing and handwriting. When children first learn to form letters, their movements are awkward and they lack fine motor coordination. The distances between lines on a page are purposely wide so children can fit the letters into the space. If paper with narrow lines is initially introduced, students' etters would spill over the borders and students might become frustrated. Once students can form letters within the larger borders, they can use paper with smaller borders to help them refine their skills. The fatigue method can be applied when disciplining disruptive students who build paper airplanes and sail them across the room. The teacher can remove the students from the classroom, give them a large stack of paper, and tell him to start making paper airplanes. After the students have made several airplanes, the activity should lose its attraction and paper will become a cue for not building airplanes. Some students continually race around the gym when they first enter their physical education class. To employ the fatigue method, the teacher might decide to have these students continue to run a few more laps after the class has begun. The incompatible response method can be used with students who talk and misbehave in the media center. Reading is incompatible with talking. The media center teacher might ask the students to find interesting books and read them while in the center. Assuming that the students find the books enjoyable, the media center will, over time, become a cue for selecting and reading books rather than for talking with other students. In a social studies class some students regularly fall asleep. The teacher realized that using the board and overhead projector while lecturing was very boring. Soon the teacher began to incorporate other elements into each lesson, such as experiments, and debates, in an attempt to involve students and raise their interest in the course.

单选题But the depth of a novel and the value of its artistic and ideological feature do not depend on the theme-either______or significant

单选题Participants in the Shanghai Co-operation Forum ______ regional teamwork to promote investment and economic development. A. cursed B. echoed C. bounced D. hailed

单选题______, the market will have to overcome some of the highest hurdles. It's seen in a long time.

单选题National poverty was ______ by rapid population growth.

单选题Many drama critics (considered) Richard Burton's interpretation of Hamlet superior (than) Sir Lawrence Olivier's version (produced) several years (earlier).

单选题The crotch rivet would not have been removed, ______.

单选题Artificial intelligence deals partly with the______between the computer and the human brain. A. profile B. mighty C. analogy D. leakage

单选题The human ear contains the organ for hearing and the organ for balance. Both organs involve fluid-filled channels containing hair cells that produce electrochemical impulses when the hairs are stimulated by moving fluid. The ear can be divided into three regions: outer, middle, and inner. The outer ear collects sound waves and directs them to the eardrum separating the outer ear from the middle ear. The middle ear conducts sound vibrations through three small bones to the inner ear. The inner ear is a network of channels containing fluid that moves in response to sound or movement. To perform the function of hearing, the ear converts the energy of pressure waves moving through the air into nerve impulses that me brain perceives as sound. Vibrating objects, such as the vocal cords of a speaking person, create waves in me surrounding air. These waves cause the eardrum to vibrate with the same frequency. The three bones of the middle ear amplify and transmit the vibrations to the oval window, a membrane on the surface of the cochlea, the organ of hearing. Vibrations of me oval window produce pressure waves in the fluid inside me cochlea. Hair cells in the cochlea convert the energy of the vibrating fluid into impulses that travel along the auditory nerve to the brain. The organ for balance is also located in the inner ear. Sensations related to body position are generated much like sensations of sound. Hair cells in the inner ear respond to changes in head position with respect to gravity and movement. Gravity is always pulling down on the hairs, sending a constant series of impulses to the brain. When the position of the head changes—as when the head bends forward—the force on the hair cells changes its output of nerve impulses. The brain then interprets these changes to determine the head's new position.

单选题During the period of economic recession, daily necessities were in short supply and had to be ______.

单选题if only the committee ______ the proposal and put them into effect as soon as possible. A) accept B) have accepted C) accepted D) should accepted

单选题There is no end to the magic within this circle of the world we live in. The greatest magicians today are 1 the physicists and chemists, the mathematicians and astronomers: the wise men seeking the answers 2 the riddles of earth and universe. But 3 of them can tell us how to walk 4 a floor, "by the law of gravitation" 5 the readiest answer 6 that. Gravitation is 7 the most familiar thing in all the world, and we were all brought 8 on the story of Newton and his apple and the law of gravitation. 9 physicists have begun to say that gravitation may be 10 an illusion. If it is an illusion, 11 it is pure magic that 12 our feet on the ground and our furniture 13 floating off into space. And who cares, 14 the magic works and the illusion is 15 ? It is all a matter of vocabulary 16 , for no two scholars have ever agreed 17 a definition of magic; but there is no denying 18 every time man has finally understood and explained a 19 he has ceased to call it magic and called it 20 instead.

单选题The phrase “soak up” in the last Para. probably means____.

单选题Battles are like marriages. They have a certain fundamental experience they share in common; they differ infinitely, but still they are all alike. A battle seems to me a conflict of will with death in the same way that a marriage of love is the identification of two human beings to the end of creation of life--as death is the reverse of life, and love of hate. Battles are commitments to cause death as marriages are commitments to create life. Whether, for any individual, either union results in death or in the creation of life, each risks it--and in the risk commits himself. As the servants of death, battles will always remain horrible. Those who are fascinated by them are being fascinated by death. There is no battle aim worthy of the name except that of ending all battles. Any other conception is, literally, suicidal. The fascist worship of battle is a suicidal drive; it is love of death instead of life. In the same idiom, to triumph in battle over the forces which are fighting for death is-- again literally--to triumph over death. It is a surgeon's triumph as he cuts a body and bloodies his hands in removing a cancer in order to triumph over death that is in the body. In these thoughts I have found my own peace, and I return to an army that fights death and cynicism in the name of life and hope. It is a good army. Believe in it.

单选题Proper ______ can ease people"s relationship and make their conversation more pleasant.

单选题Though ______ in a big city, Peter always prefers to paint the primitive scenes of country life. A) grown B) raised C) tended D) cultivated

单选题Our boss was seen ______ a new car.