如果直线l：x+y-b=0与曲线C：y=1-x2有公共点，那么b的取值范围是__

阅读理解。

     New York, London, Paris and other big cities are exciting places to live in. There are many interesting

thigs to see and to do.You can go to different kinds of museums,plays and films.You can also go shopping to buy things from all over the world.

     But there are serious problems in big cities, too. The cost of living is high,and there are too many people in some big cities. Every year many people move to the cities because there are some chances to find jobs, to study at good schools, and to receive good medical care. But sometimes these people can't find work

or a good place to live in. Also, too many people in a small space make it hard to keep the cities safe and clean.

     Some people enjoy living in big cities, and others do not. Before people move to big cities, they should think about the problems of living there.

根据短文内容判断下列句子的正误，正确的用（A），错误的用（B）。

(    )1. There are many interesting things to see and to do in big cities, like New York, London.

(    )2. You can go to all kinds of museums from all over the world.

(    )3. The cost of living in big cities is low.

(    )4. You could get better education and good medical care in big  cities.

(    )5. Moving to big cities is the best choice for you.

酸味药的作用是（）。

A.能散能行

B.能泻能燥

C.能下能软

D.能收能涩

E.能补能和

在传染病防治工作中疾病预防控制机构与医疗机构下列哪项行为是违法行为。（）

A.疾病预防控制机构、医疗机构应当定期对其工作人员进行传染病防治知识、技能的培训

B.各级疾病预防控制机构开展传染病监测、预测、流行病学调查、疫情报告以及其他预防、控制工作

C.医疗机构开展与医疗救治有关的传染病防治工作和责任区域内的传染病预防工作

D.疾病预防控制机构、医疗机构为提高防治工作成效可以公开使用涉及病人个人隐私的有关信息、资料

在浅滩整治工程中，泥质浅滩整治宜以()为主。

A.筑坝 

B.爆破 

C.疏浚 

D.堵汊

工程项目人力资源管理应特别重视（）等四点

A.坚持项目负责人制度

B.继续教育

C.建立诚信型项目管理组织

D.持证上岗

E.管好作业队伍