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假设甲公司的股票现在的市价为20元。有1份以该股票为标的资产的看涨期权，执行价格为21元，到期时间是1年。1年以后股价有两种可能：上升40%，或者降低30%。无风险利率为每年4%。 要求：要求利用风险中性原理确定期权的价值。
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Wouldn’t it be great if you could just look up at the sky and read the weather forecast right away Well, you can. The forecast is written in clouds. If you can read that writing, you can tell something about the atmosphere. With some practice, you can become a pretty good weather forecaster. Who knows, you might even do as well as meteorologists. Meteorologists use much more information than just the appearance of the clouds to make their forecast. They collect data from all over the world. Then they put it into powerful, high- speed computers. This does give the meteorologists an advantage, because they can track weather patterns as they move from west to east across the country. But you have an advantage, too. You can look at the sky and get your data directly. A meteorologist uses a computer forecast that’s several hours old to make a local forecast. What are you seeing when you look at a cloud "A picture of moisture is doing in the atmosphere," says meteorologist Peter Leavitt. There’s moisture throughout the atmosphere. Most of the time you don’t see it, because it’s in the form of an invisible gas called water vapor. Sometimes, the temperature of the air gets cold enough to cause the water vapor to change to liquid water. It’s called condensation, and we see it happen all the time (for example, when humid air from the shower hits the cold glasses of a mirror). When enough water vapor condenses, droplets come in the air. These droplets scatter light. A cloud is seen. Watching clouds over a day or two tells you a lot more than a single cloud about the weather to come. Changes in clouds show changes in the atmosphere. You should begin to notice patterns. Certain clouds, following each other in order, can signal an approaching storm. But don’t take our word for it; see for yourself. Meteorologists can make their weather forecast ___________.
设立保险公司，应当有符合《保险法》和《公司法》规定的章程、具备任职专业知识和业务工作经验的高级管理人员、符合要求的营业场所和与业务有关的其他设施等。( )
Driver’s License Test Tips This article will provide you with some simple tips for passing your driver’s license test. Adequate preparation is absolutely essential, without which any number of driver’s license test tips will be redundant. Getting a driver’s license is a big step in anyone’s life. It gives an individual the luxury to drive a car anytime he or she pleases, as driving without passing a driver’s license test is against the law. For some people, the stress can be too much to handle and as a result they may mess up on the driver’s license test. There are some simple driver’s license test tips that anyone can follow, to be assured of passing the test and getting their driver’s license. The most important of all the tips for passing your driver’s license test is to be prepared. This can only be achieved by you through hours and hours of sincere and diligent practice. If you are not sufficiently prepared for your driver’s license test, all the driver’s license tips for passing your driver’s license test will be utterly pointless and redundant. You can read as many drivers’ license test tips as you want, but if you are not practicing enough, then all these driving test tips will be in vain. Enrolling yourself in driving schools is advisable for this purpose. Tips for Passing Your Driver’s License Test Now, if you’re wondering how to prepare for your driving test, the first thing you need to know is what the driving test instructors and officials are going to be looking for. The following are the qualities that the instructors will be on the lookout for and also the parameters that the scoring will be conducted on. ● Starting the vehicle: The instructor will be observing you right from the time you start the vehicle. He will note if you turn your head to look back and if you follow all the safety regulations that are required to be followed while starting a vehicle. Here are some tips on learning to drive a car. ● Control of the vehicle: He will pay close attention to how much control you actually have over the vehicle. Your abilities with the gas pedal, the brake, the steering wheel and other controls will be scrutinized. ● Steering: Not many road test tips stress on the importance of steering. This quality is closely analyzed by the instructor and obviously if your steering is wayward (任性的), the chances of passing the driver’s license test are very slim. ● Driving in traffic: Keeping calm and avoiding panic attacks while driving in traffic is of utmost importance. Many people get extremely stressed and nervous, when they are in the midst of traffic and one of the very crucial tips to pass road test for driver’s license is to stay calm and composed when driving in traffic. Also read more on road safety and car safety. ● Traffic signs and lane discipline: This is another area that the instructors will be rating you on. Your ability to observe lane discipline and your recognition of the various traffic signs plays a major role in your passing the test. Keep these driver’s license test tips in mind to pass the test in your very first attempt. ● Stopping: Stopping the car smoothly and at the right place is a critical skill to have. When the instructor asks you to stop the car, the timing, the positioning and the technique of doing so are important driving test tips to bear in mind. ● Backing up and distance judgment: Your backing up skills and your ability to judge the distances between your vehicle and other entities will also be carefully scrutinized. If you cannot back up your vehicle satisfactorily, parking would be very troublesome for you and a major source of hazard to you and to others around you. ● Hill parking: One of the essential tips for passing your driver’s license test is to master the art of hill parking. This is not as easy as it seems and can become a major source of anxiety in a driver. If you can display good skills at hill parking, it proves that you have developed good control over the vehicle. ● Arm signals and driving etiquette: Another aspect that you will be judged on is your efficiency at giving the right arm signals at the right time. Your respect for other drivers on the road and the amount of courtesy you show them also plays a part in your final rating on the driver’s license test. Read more about defensive driving techniques and tips and defensive driving courses. Drivers who are well aware and informed about all the rules and regulations that need to be followed have a better chance of clearing their driver’s license test. The primary goal of these driver’s license test tips is to instill (慢慢灌输) a responsible and mature frame of mind in every individual. These road test tips will be pointless unless you develop a calm demeanor and unless you are aware of all the rules that must be followed while driving. More Tips Here are a few more basic drivers’ license test tips that you should keep in mind when you’re learning how to prepare for your driving test. ● Always use the restroom before your test begins. Not doing so will cause more anxiety during the test. ● Memorize all the traffic signs and their significance well in advance before the test. ● Use your rear view mirrors efficiently and regularly. ● Ensure that you are well on time for your test and are carrying all the required documents and paperwork. ● Get adequate sleep the previous night and do not give the test with an empty stomach. ● Stick to the permitted speed limit. Do not drive too fast and do not drive too slow either. Passing a driver’s license test is not simple and unless you are well versed in driver education, you could face a lot of difficulties. At the end of the day, remember that the instructors also want you to pass the test, so do your best to stay calm and composed and believe in your ability to pass the test. This cannot be reinstated enough, but the key to passing your driver’s license test is practice. During the preparation process, a few more basic tips should be______.
保险标的发生部分损失的，在保险人赔偿后三十日内，投保人可以解除合同；但保险人无权解除合同。( )
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