食管癌病人典型临床表现为A．胸骨后针刺样痛 B．胸痛，声音嘶哑 C．进行性吞咽困难

After battling hard times and danger for over nine months, British teenager Mike Perham made history last month as the youngest person to sail solo around the world.

The 17-year-old made the record after he cleared the Panama Canal and then sailed through the Caribbean and got home across the Atlantic.

Mike is only three months younger than Zac Sunderland, the 17-year-old American boy who had taken the crown as the youngest solo around-the-world sailor in July.

The two youngsters met in Cape Town in South Africa as they crossed the globe in different directions. Mike insisted they were not rivals(竞争对手). “No. It's two teenagers going out there, living their dream and having the adventure of a lifetime,” he said.

Mike may be young, but he is no stranger to sailing adventures. He picked up the hobby at the age of 6 when his father took him out in a small boat on a local lake. Father and son sailed separate boats across the Atlantic when Mike was 14, making him the youngest person to cross that ocean solo. That record gave him the taste for this even greater challenge.

On the recent journey, the scariest moment for Mike came when his sailboat was hit by storms in the southern Indian Ocean.

“We were picked up by what felt like a 60-foot wave and threw down on our side at 90 degrees,” he said.

“It felt like I was going right over. Stuff was flying around and I just thought ‘Oh no’.”

At other times, he had to dive into the Pacific and fix problems. He tied himself to the boat, jumped into the water and went to work with a knife in 30-second dives underneath the boat to cut a rope away.

Mike said he felt proud that he made his dream come true. “You've got to have confidence in yourself that you will make it,” he said.

小题1:. What's the main idea of the passage?

A．A British teenager became the youngest person to sail solo around the world.

B．How a British teenager developed his sailing hobby.

C．A British teenager's brave experience.

D．A British teenager's confidence.小题2: Which of the following statements is NOT true?

A．Mike Perham crossed the Panama Canal.

B．Mike and Zac took the crown as the youngest solo around-the-world sailor at the same age.

C．The two youngsters crossed the globe in different directions.

D．Mike was never frightened during the sailing.小题3: What does the underlined word “taste” in the fifth paragraph mean?

A．Flavor.

B．Preference.

C．Experience.

D．Ability.小题4: What can we infer from the passage?

A．Both Mike and Zac had adventured spirits.

B．Mike is older than Zac.

C．They both are brave but they have different goals.

D．Mike took up the hobby of sailing adventures at 14.小题5:What did Mike believe in?

A．Having confidence in yourself will make you successful.

B．Braveness is important in sailing.

C．One should pick up a hobby as a child.

D．Pride goes before a fall.

关于流式文档说法正确的是（）。

A.版式重排，这一特性使其能够自如地适应不同的终端设备显示环境

B.版面固定，显示和打印、印刷效果一致的文档

C.基于XML的版式文档格式，通过引用版面中的文字、图像、图形等内容来构造一个包含完整版面信息与流式信息的文档

D.文档的呈现效果不会因为软件、硬件、操作系统等外部环境的变化而发生改变

E.版式文档会因显示设备的不同而改变

鉴别诊断皮质醇增多症因垂体肿瘤亦或肾上隙肿瘤引起的试验（）

A.小剂量地塞米松抑制试验

B.大剂量地塞米松抑制试验

C.VMA测定

D.尿17-OHCS、17-KS测定

E.酚苄明试验

患者女，52岁，颈部不适2年。MRI检查结果如下图。

关于脊膜瘤，正确的是（）

A.好发于女性

B.有完整包膜

C.瘤体内可见钙化

D.发病率占髓外硬膜下肿瘤的第2位

E.可以跨硬膜生长

F.均匀中等至明显强化

计算机的时钟频率称为( )，它在很大程度上决定了计算机的运算速度。

A．字长

B．主频

C．存储容量

D．运算速度