题目内容：

It was always very cold on that lake shore in the night, but we had plenty of blankets and were warm enough. We never moved a muscle all night, but waked at early dawn in the original positions, and got up at once, thoroughly refreshed. There is no end of medicine in such an experience. That morning we could have defeated ten such people as we were the day before—sick ones at any rate. But the world is slow, and people will go to “water cures” and “movement cures” and to foreign lands for health. Three months of camp life on Lake Tahoe would bring back Egyptian mummy to life, and give him a healthy appetite. I do not mean the oldest and driest mummies, of course, but fresher ones. The air up there in the clouds is very pure and fine. And why shouldn’t it be? —it is the same the angels breathe. I think that hardly any amount of tiredness can be gathered together that a man cannot sleep off in one night on the sand by its side. Not under a roof, but under the sky; it seldom or never rains there in the summertime. I know a man who went there to die. But he made a failure of it. He was a skeleton (骨瘦如柴的人) when he came, and could barely stand. He had no appetite, and did nothing but read tracts (小册子) and reflect on the future. Three months later he was sleeping out of doors regularly, eating all he could hold, three times a day, and hunting game over the mountains three thousand feet high for fun. And he was a skeleton no longer, but weighed part of a ton. This is no fancy sketch, but the truth. His disease was consumption. I confidently recommend his experience to other skeletons.

—Mark Twain

1.Which of the following is the topic of the passage?

A. How to live near Lake Tahoe

B. The imagination of Lake Tahoe

C. The area of Lake Tahoe has amazing powers to bring back people’s health

D. Lake Tahoe’s air and water quality are fantastic for Egyptian mummies

2.The writer’s tone of this passage is ________.

A. determined    B. persuasive

C. homesick    D. entertaining

3.What does the author mean by saying the air is “the same the angels breathe”?

A. The altitude is very high.    B. The wet air surrounded the lake.

C. The cold wind in the area.    D. The wideness of the land.

4.The author uses the “Egyptian mummy” to compare to ________.

A. people who lost their families    B. sick and exhausted people

C. a dead man    D. the writers bad dream