简述自然景观南北差异的主要表现。

I don't go outside in the evening, because I'm ________.[ ]

A. scared    

B. happy     

C. quick     

D. slow 

患者，女性，48岁。因"慢性阻塞性肺疾病急性发作，Ⅱ型呼吸衰竭，肺性脑病"入院，予气管插管机械通气治疗。1天后患者神志转清，PaCO₂由102mmHg降至45mmHg。

该患者机械通气潮气量的调节，主要根据（）

A.患者意识状态

B.血气动态变化，结合pH

C.肺泡-动脉氧分压差

D.PaO₂

E.SpO₂

中年男性，双手关节痛1年，RF1：32阳性。见双手多个近端指间关节肿胀压痛，双膝关节可触及骨擦感。

对主要可能诊断帮助最大的检查是（）

A.ESR检查

B.ASO检查

C.CRP检查

D.膝关节X线检查

E.双手X线检查

The national schools’ first aid competition is an interesting way for young people to practice their first aid skills in a safe environment.

A school may have three teams. The deadline for this competition has now been continued to April 21, 2012. All teams will compete at an elimination (淘汰) round, with the winners going forward to the National Final for the chance to become the winner.

A team has three formal members, and a reserve is also needed. All team members, together with the reserve, will take part. There are two age sections:

Junior: 7 to11

Senior: 12 to 16

This competition is based on the Young First Aid Course from St. John Ambulance Training Officer. Support will be given to make sure everyone has equal chances to win.

The winners of this competition will be invited to take part in the Young Grand Prior Competition. This competition improves the practical first aid skills of young people and tests their knowledge and skills with a series of realistic accidents and injuries. Youth teams are aged between 12 and 16 years old and should have three members. Young adults are aged between 17 and 21 and should have two members. All teams may bring a reserve. The Young Grand Prior Competition will be held at the Spa Complex, Scarborough, on November 28, 2012.

Those who want to take part in the national schools’ first aid competition will have to complete our application form.

小题1: If you are fifteen and want to take part in the competition, you will _________.

A．belong to the junior sections of the first aid competition

B．complete our application form by the end of April, 2012

C．study the course of St. John Ambulance Training Officer

D．teach yourself a lot of knowledge and skills of first aid小题2: How many students will stand for a school?

A．Sixteen

B．Twelve

C．Four

D．Three小题3:Form the passage we can learn that the Young Grand Prior Competition will __________.

A．have a test with realistic accidents and injuries

B．not allow the adult competitors to take part in

C．be the highest level competition in the country

D．be held on April 21, 2012小题4:The passage is written mainly for __________.  

A．those who want to practice their first aid skills

B．the young school students in the country

C．the middle school teachers in the country

D．the young people throughout the country

锅炉补给水的离子交换处理方法有哪些？