ED50是（） A.最大致死量的一半  B.最大治疗量的一半  C.使半数动物死亡的

（15分）【历史上重大改革回眸】

材料一：居今日之中国，而与人言妇学，闻者必曰，天下之事其更急于是者，不知凡几，百举未兴。而汲汲论此，此非知本之言也。然吾推及天下积弱之本，则必自妇人不学始……故妇学实天下存亡强弱之大原也。                                                   

—— 梁启超《变法通议·论女学》

材料二：上可相夫，下可教子，近可宜家，远可善种。妇道既昌，千室良善，岂不然哉？岂不然哉？    

—— 梁启超《倡设女学堂启》

材料三：女权运动，无论为求学运动，为竞业运动，为参政运动， ……归根结底一句：无论何种运动，都要多培实力，少作空谭。女权运动的真意义，是要女子有痛切的自觉，从知识能力上力争上游，务求与男子立于同等地位。这一着办得到，那么，竞业参政，都不成问题；办不到，任你搅得海沸尘飞，都是废话。 ——梁启超《 * * 与女权》

材料四：故治天下之大本二 ：曰正人心，广人才。而二者之本，必自蒙养始。蒙养之本，必自母教始。母教之本，必自妇学始。……是故女学最盛者，其国最强，不战而屈人之兵，美是也。女学次盛者，其国次强，英、法、德、日本是也。女学衰，母教失，无业众，智民少，国之所存者幸矣，印度、波斯、土耳其是也。

—— 梁启超《变法通议·论女学》

（1）材料一中梁启超提出了什么观点？据材料二、三、四回答他提出此观点的理由。（7分）

（2）结合所学知识，分析梁启超这一主张提出的时代背景及其历史影响。（8分)

下面文章中有五处（第81-85题）需要添加小标题。请从以下选项（A、B、C、D、E和F）中选出符合各段意思的小标题。选项中有一项是多余选项。

A. Use business recordings

B. Speak slowly and clearly

C. Learn telephone manners

D. Practice often with a friend

E. Always be considerate of your friends

F. Make sure you understand the other speaker

Telephone tips

If the phone rings and someone speaks in English, don’t be afraid to answer it! The fear of talking on the phone in a second language will disappear if you practice often. Here are a few tips for helping you improve your ability to answer a call in English.

81._______________

Listening to someone speaking in a second language over the telephone can be very challenging because you cannot see the person you are trying to hear. However, it may be even more difficult for the person you are talking with to understand you. You may not realize that your pronunciation isn’t clear because your teacher and fellow students know and understand you. Pay special attention to your weak areas of your pronunciation when you are on the phone.

82._______________

Don’t pretend to understand everything you hear over the telephone. Even native speakers ask each other to repeat and confirm information from time to time. This is especially important if you are taking a message for someone else. Learn the appropriate expressions that English speakers use when they don’t hear something properly. Don’t be afraid to remind the person to slow down more than once. Keep your telephone in an area that is away from other noise distractions such as a radio or television.

83._______________.

Ask another student to practice talking on the phone with you. You might choose one night a week and take turns phoning each other at a certain time. Try to talk for at least fifteen minutes. You can talk socially, or role play different scenarios in a business environment. The most important thing about practicing telephone English is that you are not able to see each other’s mouths.

84. _______________. 

There are many ways to get free telephone English practice. After business hours, you can call and listen to recorded messages. Write down what you hear the first time, and then call back and check if your notes are accurate. Make sure you have a pen handy so that you can repeat the information and check your comprehension.

85._______________.

The way that you speak to your best friend on the phone is very different from the way you should speak to someone in a business setting. Many speakers make the mistake of being too direct on the telephone. It is possible that the person on the other line will think that you are being rude on purpose if you don’t use formal language in certain situations. Sometimes just one word such as could or may is necessary in order to sound polite. Take the time to learn how to answer the phone and say goodbye in a polite manner, as well as all the various ways one can start and end a conversation casually.

Listening to someone on the telephone is like listening to a taped recording in class. The only difference is that you have to talk back! Follow the tips above and remember that practice makes perfect!

婴儿死亡率的高低对人口自然增长有哪些影响？

交流弧焊机安装前应检查弧焊机是否完好，绝缘电阻是否合格，一次绝缘电阻不应低于（）兆欧，二次绝缘电阻不应地狱0.5兆欧。

A、0.5

B、1

C、2