题目

影响熔点的因素晶体的熔点并不是固定不变的，很多因素会影响晶体的熔点．例如：在盛有小冰块的烧杯里放些盐并搅拌，冰的炫点就会低于零摄氏度．海水冬天结冰的温度比河水低就是因为海水中溶有盐．寒冷的冬天，在汽车发动机的水套中加一些甘油作为抗凝剂，即使温度低于零下二、三十摄氏度，水套中的水也不会凝固．合金可以看做混有杂质的金属，所以合金的熔点比组成合金的每一种金属的熔点都要低． 又如：将一根两瑞桂有重物的细金阅读理解。     Research has shown that music has an important effect on one's body and psyche (心灵). In fact, there is a growing field of health care known as music therapy, which uses music to treat diseases. Even hospitals are beginning to use music therapy. This is not surprising, as music affects the body and mind in many powerful ways.     Research has shown that quick music can make a person feel more alert, while slow music can produce a calm, deep thinking state. Also, research has found that music can change brainwave activity levels. This can help the brain to change speeds more easily on its own as needed, which means that music can bring lasting benefits to your state of mind, even after you've stopped listening.     Breathing and heart rates can also be influenced by music. This can mean slower breathing, slower heart rate. This is why music and music therapy can help reduce the damaging effects of long-term stress, greatly promoting (促进) not only relaxation, but health.     Music can also be used to bring about a more positive state of mind by helping to keep worries away. Music has also been found to bring many other benefits, such as lowering blood pressure and reducing the risk of strokes. It is no surprise that so many people are considering music as an important tool to help the body become or stay healthy.                      1. What can we infer about music therapy?        A. It is a type of music.B. It is a research about music.C. It is a kind of musical effect on diseases.D. It is the use of music method to help treat diseases.2. According to the second paragraph, we can know that ________.A. music with different speeds has different effectsB. quick music is not good for one's healthC. slow music can help one to think more calmly and slowlyD. music will have less benefit after one stops listening3. The reason why music can help deal with stress is that ________.A. it is used by many hospitalsB. it can help change brainwavesC. it does good to breathing and heart ratesD. it can bring a more positive state of mind4. According to the passage, music can help deal with all the following EXCEPT ________.A. nervousness          B. mind illnessesC. strokes          D. high blood pressure