乳癖预防护理应注意以下各项，除了：A．保持心情舒畅，情绪稳定 B．适当控制脂肪类食物

阅读理解。

When you are reading something in English, you may often meet with a new word. What’s the best way to know it?

You may look it up in the English-Chinese dictionary. It will tell you a lot about the word: the pronunciation, the Chinese meaning and how to use the word. But how can you know where the word is thousands of English words? How to find it in the dictionary both quickly and correctly?First, all the English words are arranged(安排) in the letter order. In the dictionary you can first see the words beginning with letter A, then B, C, D…. That means, if there are two words “desert” and “pull”, “desert” will be certainly before “

pull”. Then if there are two words both beginning with the same letter, you may look at the second letter.

Then the third, the fourth…For example, “pardon” is before “plough”, “judge” before “just”, etc.

For example, “pardon” is before “plough”, “judge” before “just”, etc.Do you understand how to look up in the dictionary?The dictionary will be your good friend. I hope you’ll use it as often as possible in your

English study.Do you understand how to look up in the dictionary?

For example, “pardon” is before “plough”, “judge” before “just”, etc.Do you understand how to look up in the dictionary?The dictionary will be your good friend. I hope you’ll use it as often as possible in your

English study.The dictionary will be your good friend. I hope you’ll use it as often as possible in your

English study.

1. This passage is about______.

A. new words in writing

B. different dictionaries

C. the best way of reading

D. using an English-Chinese dictionary

2. In the dictionary you may not find_______.

A. how to pronounce the word

B. the spelling of the word

C. who used the word first

D. how to use the word

3. In an English-Chinese dictionary, the last word______.

A. begins with Z

B. begins with A

C. is a short one

D. is not often used

4. Which group of words is in the right order in an English-Chinese dictionary?

A. perhaps, produce, plenty

B. straight, subject, surprise

C. century, center, business

D. foreign, entrance, headache

5. In the passage the writer tries to tell us that_______.

A. we have to use a dictionary when we read something in English

B. an English-Chinese dictionary can tell us everything about a word

C. an English-Chinese dictionary can help us a lot in our English study

D. all English-Chinese dictionary are the same

如果A＞B，且C为正数，下列哪个是正确的( )

A．AB＞BC

B．A+C＞B+C

C．C-A＞C-B

D．A:B＞B:C

如图，（）的侧压水头在断面上各点恒为常数。

A．1—1断面和2—2断面

B．1—1断面和3—3断面

C．2—2断面和4—4断面

D．1—1、2—2、3—3和4—1断面

不计自重的直杆位于光滑水平面上，杆的两端分别受大小相等、方向相反、作用线相同的与′力作用，+′＝0。现用刀将直杆沿MN斜面切成A、B两小段，且A、B之间的摩擦力不计。则（）。

A.A、B两段都处于平衡状态

B.A平衡，B不平衡

C.B平衡，A不平衡

D.A、B都不平衡

下列叙述中正确的是( )。

A．线性链表的各元素在存储空间中的位置必须是连续的

B．线性链表的头元素一定存储在其他元素的前面

C．线性链表中的各元素在存储空间中的位置不一定是连续的，但表头元素一定存储在其他元素的前面

D．线性链表中的各元素在存储空间中的位置不一定是连续的，且各元素的存储顺序也是任意的