对于动物发育毒性试验中，雌雄性交配前－受孕－雌性受精－雌性着床期间染毒属于哪个阶段的

阅读理解。

      Do you think it difficult to learn English?

      If you have a problem speaking English, you can do several things. Listen to English as much as possible.

Learn a poem or a song by heart. And practice speaking with your friends as much as you can.

     Many people find it difficult to understand the listening materials in English. The answer is to listen as much

as you can. However, don't do too much at one time. It is better to practice listening for five minutes every day. Don't sit down and listen for an hour at a time, That's too much. Do choose listening materials that are

interesting and not too difficult. Choose tapes on which people speak clearly and not too fast. Take it easy at

first. Start with simple materials and later on you can practice listening to some difficult materials.

     As for writing, how can you learn to write well? How do you use words like in, on, of and for? There are

two answers to this. First, study new vocabularies. Make a list of new words and phrases, such as look for,

look after and so on. Second, read as much English as possible, and go over the materials many times. Then

you'll be able to use words correctly yourself. So, in order to write well, you must first learn to read much!

1. The meaning of the underlined phrases go over is probably "_______" here in Chinese.

A. 详细注释

B. 认真背诵

C. 仔细检查

D. 仔细琢磨

2. Which is the right way to practice listening according to the passage?

A. Listening for an hour every day.

B. Listening for five minutes every day.

C. Choose tapes on which people speak fast.

D. Listening to difficult materials in the very beginning.

3. According to the last paragraph, if we study a new word "get", what should we do?

A. Practice it many times.

B. Read it five minutes every day.

C. Study it with other new words.

D. Write it as many times as you can.

4. In order to write well, what should you do first?

A. Learn to use.

B. Learn to read

C. Learn to spell

D. Learn to listen.

5. This passage mainly tells us how to improve your ____ skills.

A. listening and reading

B. reading and speaking

C. listening and writing

D. reading and writing

下列各句依次填入各句横线处的词语，最恰当的一组是 （   ）

①林则徐这位禁毒先驱的铜像           在美国大都会纽约，对世界人民的反毒斗争是一种鼓舞。

②面对拥有资本与品牌的强势国际企业竞争，一个具有长远抱负的本土型企业进行品牌的

 __________与集中，是刻不容缓的重要工程。

③王小川见到分别多年的老同学张勇，起初惊讶，           暗暗佩服，心中觉得老同学发展很好，真该刮目相看了。

A．竖立整合继而

B．树立整合既而

C．树立组合继而

D．竖立组合既而

检测值达到临床上必须采取措施的检测水平称为（）

A.正常参考范围上限

B.正常参考范围下限

C.正常参考均值

D.危急值

E.医学决定性水平

某工程地下室1层，地下建筑面积4000m，场地面积14000m。基坑采用土钉墙支护，于5月份完成了土方作业，制定了雨期施工方案。计划雨期主要施工部位：基础SBS改性沥青卷材防水工程、基础底板钢筋混凝土工程、地下室1层至地上3层结构、地下室土方回填。本工程中使用了SBS改性沥青卷材等材料，如何对市场调查实施阶段形成的相关资料和数据进行定性和定量分析，试结合下列问题作出正确判断。

定量描述分析数据的集中趋势在于解释被调查者回答的集中度，通常用最大频数或最大频率对应的类别选项来衡量。

按剖视图上被剖切的范围划分，剖视图可分为（）。

A、3种

B、4种

C、5种

D、6种