急性上呼吸道感染会并发或继发什么疾病，以下不正确的是（） A.急性鼻窦炎 B.中耳炎

2010年5月1日至10月31日，以“城市，让生活更美好”为主题的第41届世界博览会在上海举行；2011年8月12日至23日第26届世界大学生夏季运动会在深圳也成功举行。据此回答1~2题。

1．继北京奥运会后，我国又承办第41届世博会和第26届大运会运会。这表明 [ ]

①我国国际地位不断提高，综合国力不断增强

②随着经济的发展，我国已经迈出社会主义初级阶段，步入发达国家行列

③我国对外开放取得巨大成就

④我国作为一个和平、合作负责任的大国活跃于国际舞台

A．①②③

B．①③④

C．①②④

D．②③④

2．两大盛会的会场内外，都活跃着成千上万的志愿者，他们不计报酬，用灿烂的微笑和优质的服务迎接着各方来客。我们从中感受到 [ ]

①面对责任不计代价和回报，是有责任心的人的共同情感

②争做志愿者应当成为我们中学生当前的主要责任

③他们在参与社会公益活动的过程中，既承担着社会责任，又在帮助他人

④我们应当在自觉承担责任中不断成长

A．②③④

B．①②③

C．①②④

D．①③④

Sixty-five million years ago, an asteroid (小行星) that crashed on Earth led to the disappearance of the largest animals that have ever walked our planet – the dinosaurs. At least, this is what some scientists believe. But that accident happened so long ago. People have come to believe that we are free of threats from asteroids and everything else from space.

However, what happened on Feb 15 , 2013 was a reminder that we’re just as vulnerable as the dinosaurs once were. Two objects from space – a meteor (陨石) and an asteroid called 2012 DA14 –  visited Earth’s atmosphere on the same day. The former fell in Russia, injuring 1,200 people, while the latter passed by Earth at a record-setting close distance.

Scientists had been expecting the asteroid since last year, but the meteor was a surprise. NASA’s telescope system only detects asteroids at least 50 meters in diameter (直径), which is just about the size of 2012 DA14. But the meteor was much smaller, which made it harder to spot.

But what if we do spot an asteroid that is headed right for Earth? There are several possible ways in which dangerous asteroids could be made to change its orbit. Which method is best depends on several factors and most importantly  –  how much time we have to stop it.

If there is enough time before the hit, we can send off a heavy spacecraft to travel alongside the asteroid. The gravity from the spacecraft would gradually change the rock’s orbit. Besides that, scientists could one day use sun-powered lasers to either make asteroids disappear or change their course. If there’s not enough time, we’ll have to go after the asteroid with a spacecraft and change its orbit with a crash. Finally, if things are truly desperate, there will be only one choice left –  to use a nuclear bomb. That could turn the asteroid into a meteor shower, which would be even more dangerous.

小题1:The author mentioned the asteroid that led to the dinosaurs’ dying out to ______.

A．show that asteroids fall from space frequently

B．alert people about the possible danger of objects falling from space

C．inform readers about the constant threats the Earth faces

D．suggest that there are still many mysteries about the universe小题2:The underlined word “vulnerable” in the second paragraph probably means ______.

A．unprotected

B．lonely

C．stupid

D．self-important小题3:Which of the following statements is TRUE about the meteor that fell to the Earth in Russia?

A．It passed by the Earth at a close distance.

B．It was spotted by NASA’s telescope system a year ago.

C．It is about the same size as the asteroid that passed by the Earth.

D．It fell to the Earth and caused great damage to the local community.小题4:What is the main idea of the article?

A．Learning about asteroids and meteors.

B．The threats of objects from space and possible solutions.

C．NASA’s latest technology to discover visitors to the Earth from space.

D．How to measure the damage of collisions from asteroids and meteors.

常用于表面麻醉的是（）。

A.丁卡因

B.布比卡因

C.利多卡因

D.普鲁卡因

E.阿替卡因

社区营养工作的主要内容

营业型汽车运输和自用型汽车运输的优缺点各是什么？