达尔文的进化理论揭示了地球上所有生物都来源于原始的，不同生物之间存在着关系。

下列实验操作正确的是                  （   ）

A．注液：用分液漏斗向装有盐酸的烧杯里加入水玻璃

B．测pH：将pH试纸插入某溶液中，变色后与比色卡对比，读取pH

C．称量：用托盘天平准确称氢氧化钠固体+烧杯总质量为25．56g

D．取量：用酸式滴定管准确量取25．00mL溴水

Do you long for lasting camp memories? Sure we can guarantee it.

Shadow Ridge Summer Camps offer so many exciting things for campers to do. Unlike other camp programs that include horses as a small part of their program, at Shadow Ridge horses ARE the program ! We are 100% horse from stable（马厩）management, nature walks, and track rides to bedroom furnishings.

Horses help us achieve many of our aims. Girls can learn to develop responsibility, self-confidence and personal connections in their lives while having fun. Using horses as a wonderful tool for education, our camps offer an interesting place for growth and learning:

Imagine each girl having her very own horse to spend time with and a best friend to love and take care of. Each camper is responsible for a horse for the week. Our riding program provides a lot of riding and lesson time. Campers will learn how to take care of the horse and the tack（马具）, as well as how to ride. Days are filled with horse-related activities to strengthen the connection between each girl and horse, as the girls learn to work safely around the horses.

At Shadow Ridge we try to create a loving, caring family atmosphere for our campers. We have “The Bunkhouse”（4 girls）, the “Wranglers Roost”（4 girls）, and “The Hideout”（2 girls）in our comfortable 177-year-old farm house. All meals are home cooked, offering delicious and healthy food for the hungry rider.

Our excellent activities create personalized memories of your child’s vacation. Each child will receive a camp T-shirt and a photo album （usually 300-500 pictures） of their stay at camp.

Our camps are offered during June, July and August 2013, for small groups of girls aged13-16 years, not only from Canada but also other parts of the world.

We will send you full program descriptions at your request.

小题1:What is the main purpose of the passage?

A．To attract people to the camps.

B．To talk about camping experiences.

C．To describe the programs of the camps.

D．To explain the aims of the camps.小题2:What do we know about the camp programs at Shadow Ridge?

A．Campers are required to wear camp T-shirts.

B．Horses play a central role in the activities.

C．Campers learn to cook food for themselves.

D．Horse lessons are offered all the year round.小题3:The programs at Shadow Ridge mainly aim to help people ________.

A．understand horses better

B．enjoy a family atmosphere

C．have fun above other things

D．achieve an educational purpose小题4:The passage is written mainly for ________.

A．horse riders

B．teenage girls

C．Canadian parents

D．international travelers

（）组织的强度、硬度并不高，但塑性韧性都很好。热轧一般在该状态下进行。

简述资源的期间分配。

三等水准前后视距差不应大于（），前后视距累计差应小于（）。