心房间隔缺损最具诊断意义的X线征象是（）。 A.主动脉结缩小或正常 B.肺门舞蹈征

下列关于四大发明阐述正确的有（ ）

①四大发明均由阿拉伯人传入欧洲    

②北宋制成罗盘针并开始运用于航海

③西汉的“蔡侯纸”是人类书写史上的一次伟大革命

④世界上最早的标有确切日期的活字印刷品是《金刚经》

⑤唐朝末年火药开始运用于军事

A．①②⑤

B．②④⑤

C．②③④

D．①④⑤

在下面的括号里填上适当的分数。   

710g =（    ）kg                2030mL=（    ）L   

125dm²=（    ）m²            175cm²=（    ）dm²

阅读理解。

     With the development of science and technology, most of us will comment:"Life is speeding up.

Everyone is getting unwell."

     This may sound like something someone would say today. But in fact, an unknown citizen who

lived in Rome in 53 AD wrote it.

     We all love new inventions. They are exciting, amazing and can even change our lives. But have

all these developments really improve the quality of our lives?

     Picture this, you're rushing to finish your homework on the computer. Your mobile phone rings,

a QQ message from your friend appears on the screen, and the noise from the television is getting

louder and louder. Suddenly the computer goes blank and you lose all your work. Now you have

to stay up all night to get it done. How calm and happy do you feel?

     Inventions have speeded up our lives so much that they often leave us feeling stressed and tired.

Why do you think people who live far away from noisy cities, who have no telephones, no cars,

even no electricity often seem to be happier? Perhaps because they lead simpler lives.

     One family in the UK went "back in time" to see what life was like without all the inventions we

have today. The grandparents, with their daughter, and grandsons Benjamin, 10, and Thomas, 7,

spent nine weeks in a 1940s house. They had no washing machine, microwave, computer or mobile

phones.

     The grandmother, Lynn said, "It was hard physically, but not mentally." She believed life was less

materialistic. "The more things you have the more difficult life becomes." She said. The boys said they

found less to fight over, such as their computer. Benjamin also noticed that his grandmother had

changed from being a "trendy, beer- drinking granny to one who cooked things".

     Here are some simple ways to beat the stress often caused by our inventions!

●Don't be available all the time．Turn off your mobile phone at certain times of the day．Don't

check your emails every day．

●Make sure you spend some time talking to your family．Set aside one evening a week when you

don't turn on the television．Play cards and chat instead．

●Get a low-tech hobby．Every day,do something in the old-fashioned way,such as walking to have

a face-to-face meeting instead of using the email or telephone．

●Don't worry too much about life-laugh more!

1. The passage is mainly about          .

A．the important roles technology plays in our everyday life

B．improvements of our life with technology

C．problems with technology

D．major changes are likely to happen to technology

2. The writer uses the quote at the beginning of the story to        .

A．point out that you experience some big problems and they may be the same

B．tell us what life was like long time ago

C．make us wonder what causes such a thing to happen

D．share a truth about life

3. Why did the family choose to spend some time in a 1940s house?

A．Because they were curious about how people lived without modern inventions.

B．Because they liked to live simple lives.

C．Because they were troubled by modern inventions.

D．Because living in a different time would be a lot of fun for them.

4. What does the underlined word "available" in the first suggestion offered by the writer mean?

A．Busy on line.

B．Free.

C．Be able to move.

D．Be found by others.

5. The writer may support that ______

A. you ring back your boss immediately when you get home and see his message to you.

B. you take your iphone and taptop and power them on all the time while traveling.

C. you find fun in some exercise like hiking and jogging instead of chatting on the Internet.

D. you check your mail account as frequently as you can.

克利斯提尼废除传统四血缘部落而代之以十地区部落，按新部落体制进行选举。实际上这些新部落就是城邦的选举区，仅袭用部落之名而已。由于雅典政坛上早有平原、山地、海岸三派之分，这个办法巧妙地利用了原来血缘部落也分三个“三一区”的传统，只是旧“三一区”是按胞族划分，现在则按地区户籍组成，而且兼容平原、山地、海岸三部分。这一做法（）

A.有利于减轻平民疾苦、缓和社会矛盾

B.基本铲除了旧的氏族贵族的政治特权

C.兼顾了平原、山地、海岸三派的利益

D.为工商业奴隶主开始掌权准备了条件

钢结构中，系杆的符号是（）。

A.SC

B.LT

C.XG

D.ZC