下列哪项属于高危儿（） A.母亲有贫血病史 B.新生儿在出生时有使用镇静剂和止痛

阅读下面的短文，并完成短文后的任务。

      You will find traffic noise disappearing as soon as you arrive in Venice. So as you walk down the narrow

streets, you only have to avoid (避免) crowds of people. (3) About 19 million travellers visit Venice for the

enjoyable environment, art and food each year.

      Seeing Venice on foot is the best. You can walk through the city in about an hour. Look around St.Mark's

Basilica and the Doge's Palace. (4) But you should know walking along the streets isn't as easy as traveling on

the city's canals. The canals are Venice's "streets". And you can enjoy the Grand Canal, the Rialto Bridge and

many wooden buildings.

      Venice is fantastic. You shouldn't miss it in your life. No matter how long you're in Venice, it will leave a

pleasant feeling on you.

1. Why will you find noise disappearing as soon as you arrive in Venice?

2. What can you enjoy in Venice when traveling on the city's canals?

将短文中划线的两个句子译成汉语 

3.                                                                                                  

4.                                                                                                 

5. 请给短文拟一个适当的标题

冰蓄冷空调系统中的蓄冰率是指( )。

A．蓄冰槽中冰的重量与水的重量之比的百分数

B．蓄冰槽中水的重量与冰的重量之比的百分数

C．蓄冰槽中冰占用的容积和蓄冰槽的有效容积之比的百分数

D．蓄冰槽的有效容积和蓄冰槽中冰占用的容积之比的百分数

患者男性，46岁，因“发热、右上腹痛3日”来诊。初步诊断：急性胆囊炎。应用庆大霉素、异帕米星控制感患者男性，58岁，因“咳嗽6日”来诊。初步诊断：急性咽炎。给予头孢拉定餐后口服。

关于餐后服用头孢拉定，叙述正确的是（）

A.合理。餐后服用，胃内容物可使药物迅速进入肠道吸收部位，提高其血药浓度峰值

B.合理。餐前服用，肠道吸收时间延迟，使其血药浓度峰值降低25%～50%，而餐后服用可以避免此影响

C.不合理。餐后服用，肠道吸收时间延迟，血药浓度峰值降低；应该餐前1～2小时服用，避免胃内容物影响而降低血药浓度峰值

D.合理。因为进餐时间不影响头孢拉定血药浓度

E.不合理。应餐后1小时服用

在计算某病分年龄段的发病率时，某一年龄段发病率的改变会引起其他年龄段的发病率发生相应改变。