问题：
[单选题]How can you estimate the position of a tropical storm’s center?（）
A、With a radio weather bulletin or weather fax
B、using shipboard radar
C、observe the wind direction and apply Buys Ballot's law
D、All of the above
参考答案：
D
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- ● Wie buying i a poitive way in which you can make your money go further. The （）you go about purchaing an article or a ervice can actually （）you money or can add （）the cot. Take the （）example of a hairdryer. If you are buying a hairdryer, you might （）that you are making the （）buy if you chooe one （）look you like and which i alo the cheapet （）price. But when you get it home you may find that it （）twice a long a a more expenive （）to dry your hair. The cot of the electricity plu the cot of your time could well （）your hairdryer the mot expenive one of all. So what principle hould you （）when you go out hopping? If you （）your home, your car or any valuable （）in excellent condition, you’ll be aving money in the long （） Before you buy a new （）,talk to omeone who own one. If you can, ue it or borrow it to check it uit your particular （） Before you buy an expenive （）,or a ervice, do check the price and （）i on offer. If poible, chooe （）three item or three etimate. 请在第（）处填上正确答案。
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- ● Wie buying i a poitive way in which you can make your money go further. The （）you go about purchaing an article or a ervice can actually （）you money or can add （）the cot. Take the （）example of a hairdryer. If you are buying a hairdryer, you might （）that you are making the （）buy if you chooe one （）look you like and which i alo the cheapet （）price. But when you get it home you may find that it （）twice a long a a more expenive （）to dry your hair. The cot of the electricity plu the cot of your time could well （）your hairdryer the mot expenive one of all. So what principle hould you （）when you go out hopping? If you （）your home, your car or any valuable （）in excellent condition, you’ll be aving money in the long （） Before you buy a new （）,talk to omeone who own one. If you can, ue it or borrow it to check it uit your particular （） Before you buy an expenive （）,or a ervice, do check the price and （）i on offer. If poible, chooe （）three item or three etimate. 请在第（）处填上正确答案。
