题干

脂质是生物体需要的重要营养素之一,它与糖类、蛋白质和核酸共同构成细胞中四大有机物,以下说法正确的是(    )

A:脂质是生物体内主要的贮能物质

B:糖类和脂质可以为生命活动供能,蛋白质和核酸不能

C:脂质鉴定实验中用95%的酒精可以洗去浮在脂质组织表面的染色剂

D:检测花生子叶切片中的油脂时出现部分清晰部分模糊的原因可能是材料厚薄不均

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答案(点此获取答案解析)

D

同类题4

根据短文内容和所给中文提示,在空白处写出单词的正确形式。每空限填一词。

Life as Chopsticks

Right now, more and more people are digging into their food with ____ (二) sticks which are called chopsticks. Even people eating with knives and ____ (餐叉) begin to love them. What’s so special about them? Because they have deep influence in many people’s ways of life.

Simplicity. There's____ (几乎不) anything simpler than chopsticks. With new technology developing every day, there is ____   (仍然) something that has just one use —simply to eat. Also the chopsticks don't ____ (花费) much. In real life, we don’t need to keep improving things all the time.

 Aim. When using chopsticks,you can not pick up everything in one go. Know what you want and just do it. Sometimes, a little bit of focus makes the difference ____ (在…之间) failure and success.

 Practice. Using chopsticks doesn’t come naturally. You have to learn to use them and practice it. Most would ____ (同意) that there’s no better way than to practice. In real life, you may have many things you want to do, but it will just be a ____ (梦想) if you don’t try doing it.

 Slowing down. A healthy way to eat is to eat with chopsticks. It slows you down and it ____ (允许) your stomach to tell your brain you are full before you overeat. In our life, we sometimes need slow down to have time to think, to realize that we’re actually full and don’t have to rush full ____(速度) through life.