Cho hình chóp S. ABCD đáy ABCD là hình thang (AB//CD). a) Xác định giao tuyến của hai mặt phẳng (SAB) và (SCD) b) Gọi I, J lần lượt là trung điểm AB, BC. Chứng minh AC // (SIJ) Ai giúp mình voi ạTT

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Work on the human brain has indicated how different parts are centers of activities for different skills, feeling, perceptions and so on. It has also been shown that the left and right halves, or hemispheres, of the brain are (1) for different functions. While language is processed in the right, or emotional hemisphere. However, professional musicians have the tendency to process music in the left hemisphere more often than those without musical training do. This (2) they are having a different experience - which is likely to be the case because they are analyzing music rather than just listening to it. (3) of music like tone, pitch and melody are all probably processed in different parts of the brain. Some features of musical experience are processed not just in the auditory parts of the brain, but in the visual ones. We don’t yet fully understand the (4) of this. The tempo of music seems to be (5) related to its emotional impact, with fast music often felt as happier and slower music as sadder. It is the same with the major biological rhythm of the body: our heart (6) quickens when we are happy, but slows when we are sad. Military music may have (7) from attempts to get us ready for battle by using fast drumming to (8) our hearts to beating faster. Music is perhaps one of the most complex experiences the brain copes with and it has become an absolutely (9) part of our ritual and ceremonies. It has power beyond language to (10) mood and co-ordinate our emotional states 1. A. amenable B. dependable C. reliable D. responsible. 2. A. suggests B. advances C. introduces D. proposes 3. A. views B. factors C. aspects D. pieces. 4. A. expectations B. implications C. assumptions D. propositions 5. A. surely B. plainly C. directly D. evidently 6. A. pulse B. speed C. pace D. rate. 7. A. extended B. evolved C. advanced D. elevated. 8. A. activate B. motivate C. animate D. stimulate 9. A. dominant B. important C. compulsory D. vital 10. A. notify B. communicate C. associate D. report