—I am really struck by your spoken English. You speak so fluently. Have you been abroad?

—Yes. I ______ in London for two years.

—I am really struck by your spoken English. You speak so fluently. Have you been abroad?

—Yes. I ______ in London for two years.

—I am really struck by your spoken English. You speak so fluently. Have you been abroad?

—Yes. I ______ in London for two years.

下列关于物理学史实的说法正确的是（   ）

下列关于物理学史实的说法正确的是（   ）

下列关于物理学史实的说法正确的是（   ）

根据短文理解，选择正确答案。

    Throw out the bottles and boxes of drugs in your house. A new theory suggests that medicine could be bad for your health. This new theory argues that healing (the process of becoming healthy and strong again) is at our fingertips: we can be healthy by doing Reiki on a regular basis.

    Supporters of medical treatment argue that medicine should be trusted since it is effective and scientifically proven. They say that there is no need for spiritual methods such as Reiki, Yoga, Tai Chi. These waste our time, something that is quite precious in our material world. There is medicine that can kill our pain and x-rays that show us our broken bones. We must admit that these methods are very effective in the examples that they provide. However, there are some "everyday complaints" such as back pains, headaches, which are treated currently with medicine. When you have a headache, you take an Aspirin; when you cannot sleep, you take Xanax without thinking of the side effects of these. When you use these pills for a long period, you become dependent on them; you cannot sleep without them. We pay huge amounts of money but never get better. How about a safer and more economical way of healing? When doing Reiki to yourself, you do not need anything except your energy so it is very economical. Also, there are no side effects and it is scientifically explained.

    They also claim that serious illnesses such as HIV/AIDS and cancer cannot be treated without drugs. They think so because these patients spend the rest of their lives in the hospital taking medicine. How can Reiki make these people healthy again? It is very unfortunate that these patients have to live in the hospital losing their hair and weight because of the side effects of the medicine they take. Actually, instead of drugs which are expensive and have many side effects, you can use your energy to overcome the hardships of life, find an emotional balance, leave the stress of everyday life and let go of the everyday worries.

    Some people may still hold that in our material world, everything depends on time. How would it be possible to find time to do Reiki? In fact, Reiki does not require more than 15 minutes of our time. It is less time consuming than medicine if we think of all the time we spend taking medicine for some complaints and taking some more for the side effects as well.

根据短文理解，选择正确答案。

    Throw out the bottles and boxes of drugs in your house. A new theory suggests that medicine could be bad for your health. This new theory argues that healing (the process of becoming healthy and strong again) is at our fingertips: we can be healthy by doing Reiki on a regular basis.

    Supporters of medical treatment argue that medicine should be trusted since it is effective and scientifically proven. They say that there is no need for spiritual methods such as Reiki, Yoga, Tai Chi. These waste our time, something that is quite precious in our material world. There is medicine that can kill our pain and x-rays that show us our broken bones. We must admit that these methods are very effective in the examples that they provide. However, there are some "everyday complaints" such as back pains, headaches, which are treated currently with medicine. When you have a headache, you take an Aspirin; when you cannot sleep, you take Xanax without thinking of the side effects of these. When you use these pills for a long period, you become dependent on them; you cannot sleep without them. We pay huge amounts of money but never get better. How about a safer and more economical way of healing? When doing Reiki to yourself, you do not need anything except your energy so it is very economical. Also, there are no side effects and it is scientifically explained.

    They also claim that serious illnesses such as HIV/AIDS and cancer cannot be treated without drugs. They think so because these patients spend the rest of their lives in the hospital taking medicine. How can Reiki make these people healthy again? It is very unfortunate that these patients have to live in the hospital losing their hair and weight because of the side effects of the medicine they take. Actually, instead of drugs which are expensive and have many side effects, you can use your energy to overcome the hardships of life, find an emotional balance, leave the stress of everyday life and let go of the everyday worries.

    Some people may still hold that in our material world, everything depends on time. How would it be possible to find time to do Reiki? In fact, Reiki does not require more than 15 minutes of our time. It is less time consuming than medicine if we think of all the time we spend taking medicine for some complaints and taking some more for the side effects as well.

根据短文理解，选择正确答案。

    Have you felt annoyed when a cell phone rings during the class? Something must be done to stop this. Now in New York City, USA, a rule is carried out in schools. Students can't even bring cell phones to school. Is it a good thing or not?

    Anxious parents say that cell phones are an important tool in holding New York City's families together.

    "I worry about it." said Elizabeth Lorris Ritter, a mother of a middle school kid. "It's necessary in our everyday life. We have a washing machine. We have running water, and we have cell phones."

    Many American parents think cell phones connect them to their children on buses, getting out from subways, walking through unknown places.

    "I have her call me when she gets out of school," said Lindsay Walt, a schoolgirl's mother. "No one in New York is going to let their child go to school without a cell phone."

    What about the cell phone owners, the students? Most of the students said cell phones were essential and the cell phone was like an extra hand or foot for them.

    "I feel so empty," said May Chom, 14. There is also no way to listen to music on the way to school without my phone. It will be a really, really boring trip."

如图所示，在光滑水平布的弹簧振子，弹簧形变的最大限度为20cm，图示P位置是弹簧振子处于自然伸长的位置，若将振子m向右拉动5cm后由静止释放，经0.5s振子m第一次回到P位置，关于该弹簧振子，下列说法正确的是（   ）

如图所示，弹簧的一端固定在竖直墙上，质量为M的光滑弧形槽静止在光滑水平面上，底部与水平面平滑连接，一个质量为m（m＜M）的小球从槽高h处开始自由下滑，下列说法正确的是（   ）

如图所示，倾角为α的斜面体（斜面光滑且足够长）固定在水平地面上，斜面顶端与劲度系数为k、自然长度为l的轻质弹簧相连，弹簧的另一端连接着质量为m的物块．压缩弹簧使其长度为 $\frac{3}{4}$ L时将物块由静止开始释放（物快做简谐运动），且物块在以后的运动中，斜面体始终处于静止状态．重力加速度为g．

如图所示，倾角为α的斜面体（斜面光滑且足够长）固定在水平地面上，斜面顶端与劲度系数为k、自然长度为l的轻质弹簧相连，弹簧的另一端连接着质量为m的物块．压缩弹簧使其长度为 $\frac{3}{4}$ L时将物块由静止开始释放（物快做简谐运动），且物块在以后的运动中，斜面体始终处于静止状态．重力加速度为g．

如图所示，倾角为α的斜面体（斜面光滑且足够长）固定在水平地面上，斜面顶端与劲度系数为k、自然长度为l的轻质弹簧相连，弹簧的另一端连接着质量为m的物块．压缩弹簧使其长度为 $\frac{3}{4}$ L时将物块由静止开始释放（物快做简谐运动），且物块在以后的运动中，斜面体始终处于静止状态．重力加速度为g．

一简谐振子沿x轴振动，平衡位置在坐标原点．t=0时刻的位移x=﹣0.1m；t= $\frac{4}{3}$ s时刻x=0.1m；t=4s时刻x=0.1m．该振子的振幅和周期可能为（   ）

将一测力传感器连接到计算机上就可以测量快速变化的力，图甲中O点为单摆的悬点，现将小球（可视为质点）拉到A点，此时细线处于张紧状态，释放摆球，则摆球在竖直平面内的ABC之间来回摆动，其中B点为运动中最低位置，∠AOB=∠COB=α，α小于10°且是未知量．图乙表示由计算机得到细线对摆球的拉力大小F随时间变化的曲线，且图中t=0时刻为摆球从A点开始运动的时刻，根据力学规律和题中信息（g取10m/s²）求：