下列式子正确的是（ ） A．a2+a3=a5 B．a2•a3=a6 C．a2•a

阅读理解。

     Have you ever seen the film Traveling Bird? In the film, groups of birds fly high above the sky and cross

the way above snow, rivers, fields, sea and grassland. I'm sure you will love the beautiful picture when you

see the film.

     But you may not feel so good if you have learnt about bird flu (禽流感) from TV or on the Internet. Some

governments had to kill chickens in their cities. A large number of chickens and even some people died in Asia,

and nearly 8,500birds died in Russia because of bird flu.

     Chickens can get bird flu from the feces (粪便) of the passing birds. It is not so difficult to control the

chicken in cages or on farms. But it is much more difficult to control the birds in the sky.

     Luckily, scientists have found a medicine for bird flu. But the virus (病毒) can change easily and quickly.

So bird flu is still a serious problem we must face.

根据短文内容，判断下列句子的正误，正确的用“T”，错误的用“F” 。

( )1. We know how birds get bird flu from the film Traveling Bird.

(     )2. Not only birds and chickens but also man can get bird flu.

( )3. The feces of the passing birds can not cause bird flu.

(     )4. It is easier to control chickens than to control flying birds.

( )5. Scientists have found the medicine, so we needn't worry about bird flu any more.

患儿，4岁。发热3天，伴咳嗽、流涕。查体：眼结膜充血，第一磨牙对面的颊结膜有一直径约1mm的灰白色小点，外面围着红色的圈晕。血常规白细胞在正常范围，淋巴细胞偏高。

该患儿最可能的临床诊断是（）

A.风疹

B.幼儿急疹

C.猩红热

D.麻疹

E.药疹

在联合国体系中，有权根据 * * 规定作出各会员国必须执行的决议的机构是（）。

A.经济及社会理事会

B．托管理事会

C.安全理事会

D．国际法院

一位君王晚年亲征高丽，取道碣石，路经秦皇岛，写下了著名的《春日望海》，请问这位君王是谁？

概略定向中不要求的是（）。

A、超前读图和概括地形

B、运动中读图

C、步行

D、简化地图