水温为什么对混凝效果有明显影响？

该病例的超声心动图所见，最可能的诊断是（）。

A.二尖瓣腱索断裂

B.二尖瓣赘生物

C.二尖瓣口黏液瘤

D.二尖瓣脱垂

E.二尖瓣叶裂

审查起诉阶段，案件已经侦查终结，辩护律师和其他辩护人会见在押犯罪嫌疑人、被告人时，人民检察院、人民法院__________。

A．不派员在场

B．应当派员在场

C．根据案件情况和需要可派员在场

D．由检察长、院长决定是否派员在场

This dictionary tells you about English words and how to use them in reading, writing and speaking English. It not only gives the meaning of words, it can also help you with spelling, word-building, grammar and pronunciation.

To use your dictionary correctly, you need to understand how the dictionary works. At the front of the book, you will find some exercises to help you make the most use of your dictionary.

If you look up the word “colour”, you will find two spellings for this word. “Colour” is used in British English, while “color” is used in American English. When there are differences between British and American spelling, the dictionary shows it with the word “BrE” for British English and “AmE” for American English.

The dictionary also helps you pronounce words correctly. We use a special alphabet (特殊字母) to show pronunciation. If you turn to the inside back face, you will see all the phonetic letters (音标) with some words to show you how they are pronounced. Just look at the inside back cover when you’re not sure how to say a word.

The most important reason for using a dictionary is to find out the meaning of a word—its definition

In this dictionary, the definitions have been written using only 2000 words. This means that the definitions of even the most difficult words are simply explained and easy to understand.

When a word has more than one meaning, read all the meanings until you find the one that correctly tells the use of the word you are looking for.

Most of the words in this dictionary can be used by people in all parts of the world.

小题1:The AmE spelling of the Chinese word “颜色” in this dictionary is ________.

A．colour

B．colar

C．color

D．corner小题2:The phonetic alphabet help you ________ each word correctly.

A．understand

B．write

C．say

D．know小题3:The underlined word ‘definition’ means__________

A．词性

B．词条

C．词义

D．词库小题4:The dictionary explains ________.

A．some of the difficult words

B．all the words in the dictionary in a simple way

C．all easy words

D．the words with two meanings

完成句子，一空一词。

1. I _____ very happy today.

2. _____ tall are you ?

3. My ear _____. 

4. Jenny _____ short,blond hair.

5. I cut my _____. 

在线路上作业和巡检人员，来车时应及时下道避车，并站在安全地点，面迎列车方向，其标准是（）

A、速度≤120km/h时，不小于1400m下道、在距钢轨头部外侧2.5m以外的安全地点；

B、速度≤120km/h时，不小于800m下道、在距钢轨头部外侧2m以外的安全地点；

C、速度≤120km/h时，不小于2000m下道、在距钢轨头部外侧3m以外的安全地点；

D、速度＞120km/h时，不小于1500m下道、在距钢轨头部外侧2.5m以外的安全地点；