呼吸商是呼吸过程中（）的比值。A．吸收O2/放出CO2 B．放出CO2/吸收O2 C

Spring is an inviting season for outdoor activities. But be careful—the warm weather is also a hotbed for viruses(病毒) and disease.  

This March, the influenza(流行性感冒) A(H7N9) virus hit Shanghai, Anhui, Jiangsu and Zhejiang. It was reported that by April 11 at least 35 people had been infected (被感染的) with the H7N9 virus, and nine of them had died.

The influenza A (H7N9) virus is one type of influenza A H7 viruses. Influenza A H7 viruses normally spread among birds.

This is the first time human infections with H7N9 viruses have been reported in China. Earlier reports were about H5N1 and H1N1.

All the three viruses are influenza A viruses but they are not the same. H7N9 and H5N1 are animal influenza viruses that could infect people. However, H1N1 viruses can be divided into two groups. One group can normally infect people and the other normally infects animals. Also, H1N1 can spread from human to human, but H7N9 probably can’t, according to the World Health Organization (WHO).

Most people infected with H7N9 looked like they had the common flu. Some people had bad pneumonia(肺炎). They suffered from a fever, a cough and shortness of breath.

But don’t be afraid – it is not easy to be infected with the virus. One of the possible reasons is close contact with sick poultry (家禽) waste. People may also be infected through breath, according to National Health and Family Planning Commission.

Here are some tips from the WHO that can protect you from being infected.

Wash your hands with soap and running water before you eat, after you use the toilet, and after touching animals or animal waste.

When coughing or sneezing cover your mouth and nose with a mask(口罩)，tissue(纸巾) or a sleeve.

Get a good rest and do exercises, which will help make your body strong enough to stand up to the virus.

小题1:What’s the name of the influenza virus that hit Shanghai, Anhui, Jiangsu and Zhejiang this March?

A．It is the H7N9 virus.

B．It is the H5N1 virus.

C．It is the H1N1 virus.

D．It is A H7 virus.小题2:How many people had died by April 11according to the report?

A．About 35.

B．About 9.

C．About 44.

D．Nobody had died.小题3:What’s the Chinese meaning for “stand up to” in the last paragraph?

A．起立

B．站着

C．抵抗

D．向上小题4:Which is NOT true about protecting us from being infected by animal influenza viruses?

A．Wash our hands with soap and running water before we eat, after we use the toilet, and after touching animals or animal waste.

B．When we cough or sneeze we should cover our mouths and noses with a mask，tissue or a sleeve.

C．We should get a good rest and do exercises to make our bodies strong enough.

D．We should try to eat much and sleep much as possible as we can.

The positive meanings        words in an ad and how they are presented in an interesting way play an important role in promoting a product.

A．are attached to

B．attached to

C．attaching to

D．having attached to

（2011年山东泰安，20题）下列溶液暴露在空气中，因发生化学变化而使溶液质量增大的是

A．浓氢氧化钠溶液

B．浓盐酸

C．浓硫酸

D．饱和食盐水

论述医政管理的原则。

女性，35岁，活动后心慌气短2年，心功能评定为3级，心尖区可闻及舒张期隆隆样杂音及二尖瓣开瓣音。超声心动图示单纯二尖瓣狭窄，二尖瓣口面积<1.2cm²，目前无风湿活动和感染的表现。该患者最佳的治疗方案是（）

A.β受体阻滞剂

B.经皮二尖瓣球囊成形术

C.人工瓣膜置换术

D.地高辛治疗

E.利尿剂治疗