下列哪项是通常所指的第七类营养素（） A．牛奶 B．鸡蛋_爱下问搜题

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问题选择题

下列哪项是通常所指的第七类营养素（　　）

A．牛奶

B．鸡蛋

C．纤维素

D．水果

答案

膳食纤维是指除淀粉以外较复杂糖类物质，包括纤维素和果胶等，主要存在于蔬菜、水果、海藻和粮食等植物性食物中，纤维素等膳食纤维能促进胃肠的蠕动和排空，所以多吃一些富含膳食纤维的食物，就会排便通畅、降低人体内过高的血脂和血糖，有利于维护心脑血管的健康，因此膳食纤维被称为第七营养素．

故选：C

改错题

短文改错。
     对标有题号的每一行作出判断：
     如有错误（每行只有一个错误），则按下列情况改正：
     此行多一个词：把多余的词用斜线（\）划掉，在该行右边横线上写出该词，并也用斜线划掉。
     此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。
    此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
     注意：原行没有错的不要改。

During a summer of 2001, I started reading books
in English, mostly stories. I would learn a lot of new
words from these books, but I had terribly problems
memorizing them. I had to look up to the same word
many times, for which was quite troublesome. I realized
I do need a way to remember all this vocabulary. It was
a great achievement for myself. I started writing down
words from books that I read. I would come back from
school, and then sit for an hour and two. I wrote down
new words and added it to my collection. By the end
of last year,my collection has grown to 3,000 words.

1._____
2._____
3._____
4._____
5._____
6._____
7._____
8._____
9._____
10._____

单项选择题

在悬滴标本中呈穿梭样运动的细菌是（）

A.大肠埃希菌

B.伤寒沙门菌

C.幽门螺杆菌

D.霍乱弧菌

E.变形杆菌