鱼类腥味产生的原因是由于鱼身上存在有机化学物质甲胺，甲胺易溶

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问题选择题

鱼类腥味产生的原因是由于鱼身上存在有机化学物质甲胺，甲胺易溶于乙醇，因此，煮鱼时加些酒，能使甲胺等溶于乙醇并随加热后挥发逸去，经过这样烹饪的鱼就不再有腥味了．下列过程与上面所述原理不相似的是（　　）

A．用洗涤剂洗碗

B．用水除去衣服上的汗渍

C．用汽油除去衣服上的油污

D．用酒精将试管壁上的碘洗掉

答案

答案：A

阅读理解

Between school, homework, sports, your afterschool job, and hanging out with friends, it may

feel like there's no time for healthy eating. And when you do stop to eat, it's probably tempting to

go the quick and easy route by grabbing a burger and fries, potato chips, or candy.

Even if you take time to eat three meals a day, you may still feel hungry at times. This is

natural-during teens, a person's body demands more nutrients to grow. What's the answer? Healthy

snacks. Snacking on nutritious food can keep your energy level high and your mind alert without

taking up a lot of your time. Snacks are a great way to satisfy that hunger and get all the vitamins

and nutrients your body needs.

But you need to pay attention to what you eat. Filling your face with a large order of fries after

class may give you a temporary help, but a snack high in fat and calories will only slow you down

in the long run.

To keep energy levels going-and avoid weight gain-keep clear of foods with lots of simple

carbohydrates (sugars) like candy bars or soda. Look for foods that contain complex carbohydrates

like wholegrain breads and cereals and combine them with proteinrich snacks such as peanut butter

or lowfat yogurt (酸奶) or cheese.

Choosing healthy snacks means shopping smart. Be careful of the health claims on food packages.

Just because something is "all natural" or "pure" doesn't necessarily mean that it's nutritious. For

example, "all natural" juice drinks or sodas can be filled with sugar (which is, after all, a natural

ingredient) but all that sugar means they'll be high in calories and give you little nutrition.

A granola (麦片) bar is a good example of a snack that people think is healthy. Although granola

bars can be a good source of certain vitamins and nutrients, many also contain a great deal of fat,

including a particularly harmful type of fat called trans fat (反式脂肪酸). Check the Nutrition Facts

label on the package to be sure.

1. People think that granola bar is healthy because ________.

A. it is a good source of calories

B. it provides trans fat

C. it contains some vitamins

D. it is natural

2. In choosing healthy snacks, we should try to make sure that ________.

A. they are all natural or pure

B. they are high in nutrition

C. their packages are good

D. they contain harmless fat

3. Teens need snacks to ________.

A. keep a good figure

B. gain weight

C. help grow

D. keep healthy

4. According to the passage, all the following snacks are good EXCEPT ________.

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单项选择题

下列有关资本成本的说法中，错误的是( )。

A．资本成本的本质是企业为筹集和使用资金而实际付出的代价

B．企业的加权平均资本成本不能由资本市场和企业经营者共同决定

C．资本成本的计算主要以年度的相对比率为计量单位

D．资本成本可以视为项目投资或使用资金的机会成本

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