如图是某一时刻，太阳光照图，读图完成下列要求：（1）在图中标出地球自转方向．（2）此

What do you do if you're stranded（处于困境的）on a lonely island? Surely you need to find a way to get in touch with the outside world. Your best chance of doing this is to draw the attention of a passing plane.

　　Body signals（信号）

　　Pilots from different countries understand body signals if they have the correct training. When you wave your arms up and down in a straight line, it means "yes". When you point downwards and swing your arm from side to side, it means "no". If you want the pilot to know that it's safe to land, push your hands out in front of you and bend（弯曲）your knees. If you want to say that it's not safe to land, put your arms in the air and move them to one side.

　　Smoke signals

　　The smoke from a fire can be seen from far away, so it's a good way to draw attention. If the weather is dry, it isn't hard to start a fire. Remember, however, that fires can be very dangerous if they get out of control. Never light a fire unless you're sure that it can't spread. If the ground is dark, light smoke can be seen more easily. Green grass and leaves produce light smoke.

　　Ground-to-air signals

　　It's a good idea to build some signals, too. Use large pieces of wood to make the symbols(标记). If you can't find any wood, use earth. Some useful symbols are:

　　F "I need food and water."

　　II "I need medicine."

　　I "I am badly hurt."

　　X" I am unable to move from here."

　　Pilots' replies

　　If the pilot lowers the plane's wings from side to side, this means "message received and understood". (At night, the pilot flashes the plane's green lights.) If the pilots flies the plane in a clockwise circle, this means "message received but not understood".(At night, the pilot flashes the plane's red lights.)

However, there is no signal which means "message not received". Why not?

小题1: Which picture means "it's not safe land"?

小题2: What can we learn from the passage?

A．Swinging your arm from side to side means "yes".

B．If the ground is dark, light smoke can't be seen.

C．If you need some medicine, make a symbol "II".

D．The pilots make replies with a blue light at night.　　小题3: What is the passage mainly about?

A．The explanation of building signals on an island.

B．The importance of making signals on an island.

C．Ways of sending out signals on a lonely island.

D．Ways of receiving signals from a lonely island

下丘脑术后出现中枢性高热的处理（）。

A.大剂量应用抗菌药物

B.温水擦浴

C.乙醇擦浴

D.药物降温

E.冬眠低温治疗

下面是某单位致清华百年校庆的贺词，其中有四处不够恰当，请找出并加以修改。

清华大学百年校庆办你们好：

欣闻敝校将迎来百年华诞。我供电分公司人力资源部全体员工，谨向清华大学致以最热烈的祝贺！

2011年4月24日，清华大学将迎来建校一百周年。国校同庆，盛世盛典。在国家和社会的大力支持下，经过几代清华人锐意进取、奋发图强、不懈努力，学校各项事业取得不少进步，为国家经济建设和社会发展作出了重要贡献，赢得了广泛的社会认同，成就粲然，世所瞩目。

“饮其流者怀其源，学其成时念吾师”。此时此刻，我们怀着一份感恩之情，感激栽培我们的老师，感激维系我们的学校。我们为清华而感到骄傲和欣慰。衷心祝愿清华的未来更加灿烂辉煌！预祝清华建校一百周年庆典活动圆满成功！

××供电分公司人力资源部

二○一一年三月

（1）将        改为         ；

（2）将        改为         ；

（3）将        改为         ；

（4）将        改为         。

(1)1L1mol/LH₂SO₄溶液与2L1mol/LNaOH溶液完全反应，放出114.6kJ的热量，由此推知H₂SO₄与NaOH发生中和反应的中和热为_____________表示该中和热的热化学方程式为______________________。

(2)向1L1mol·L^-1的NaOH溶液中加入下列物质：①浓H₂SO₄；②稀硝酸；③稀醋酸，恰好完全反应的热效应△H1、△H2、△H3的关为_____________

因为燃气中常含有易与铜作用的氨和（），所以在燃气管网中最好不使用铜或铜合金制作的阀门。

A.硫化物

B.甲烷

C.氧气

D.苯