问题
单项选择题 A1型题
下列哪一项不是维生素D的理化性质（）
A.溶于脂肪及脂溶剂
B.对热不稳定
C.能抵抗酸、碱及氧
D.在紫外线照射下，可在皮肤内合成
E.是具有胆钙化醇生物活性的类固醇
答案
参考答案：B
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下列哪一项不是维生素D的理化性质（）
A.溶于脂肪及脂溶剂
B.对热不稳定
C.能抵抗酸、碱及氧
D.在紫外线照射下，可在皮肤内合成
E.是具有胆钙化醇生物活性的类固醇
参考答案：B
Learning to save money when you're young is an important lesson. All good lessons and habits begin early, and saving is a ski  ll that everyone __36__. Many people—adults included—do not have a good __37__ of saving for the long run.I have been _38__ to learn this lesson early because I have had a grass cutting business since I was 10 years old. 39__ the money I make I spend about 10 percent and save the other 90. Making sure you save and don't spend too much is a good way to __40__ wealth. I have put my earnings in a bank. Many teens I know spend all the money they earn so it never has a chance to _41__. Young people should __42_ that their teenage years are a great time to begin saving. If you have a job at high school, you _43__ have fun with some of the money. But you should also save some __44__ it will grow. Then you can begin planning for your future. When you spend money, you not only lose that money, __45__ lose the interest you could have earned by saving it. After high school, college is __46__， with expenses such as food and rent. If you can __47__ a good percentage of the money you earn as a teen, going to college and buying a house will be much easier. If you are in your thirties without any savings, you will alwa  ys have to __48__.Later in life it can be hard to start saving _49__ general cost of living is more expensive and you may only have enough to pay your _50__. If you want to buy a house and have a family, you need money to start with, which __51__ saving. Many say money cannot make you happy, and this is true. But money can help you to lead a __52__ life. Saving early will mean you will have to work for fewer years when you are older. It will also __53___ you to spend time doing the things that you want to do.__54__， it will mean you can live the way you want to without 55__.
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