D. Saving lives brings people a sense of happiness.

　　参考答案1-4 DBCD

　　【阅读理解】科普知识类

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　Scientists have found what look like caves on Mars(火星), and say they could be protecting life from the planet’s terrible environment.

　　The first caves discovered beyond the Earth appear as seven mysterious black dots on the pictures sent back by NASA’s Mars Odyssey orbiter. Each as large as a football field, they may be openings into natural caves below the Martian surface.

　　“If there is life on Mars, there is a good chance you’d find it in caves,” said Jut Wynne, one of the researchers who noticed the features while working on a US Geological Survey Mars Cave Detection Program.

　　Jonathan Clarke, a geologist with the Mars Society of Australia, yesterday described the discovery as exciting.

　　One photo taken at night by an infrared imager(红外线成像器) showed one hole to be unusually warm,suggesting hot air trapped during the day is flowing out.

　　“I said:‘Wow, that’s a cave. ’” Dr. Clarke said excitedly. “People have been looking for these for a long time;now we have found them.”

　　He agreed such caves would be perfect places to hunt for life escaping from the bitterly cold,radiation-soaked(充满辐射的),dry surface.

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